142811797251321 has 63 divisors (see below), whose sum is σ = 235360610829183. Its totient is φ = 86550453324720.

The previous prime is 142811797251311. The next prime is 142811797251457. The reversal of 142811797251321 is 123152797118241.

It is a happy number.

The square root of 142811797251321 is 11950389.

It is a perfect power (a square), and thus also a powerful number.

142811797251321 is a `hidden beast` number, since 1 + 4 + 2 + 8 + 1 + 17 + 97 + 2 + 513 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 108272245106025 + 34539552145296 = 10405395^2 + 5877036^2 .

It is not a de Polignac number, because 142811797251321 - 2¹⁵ = 142811797218553 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (142811797251311) by changing a digit.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 3549245415 + ... + 3549285651.

Almost surely, 2^{142811797251321} is an apocalyptic number.

142811797251321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

142811797251321 is the 11950389-th square number.

142811797251321 is the 5975195-th centered octagonal number.

It is an amenable number.

142811797251321 is a deficient number, since it is larger than the sum of its proper divisors (92548813577862).

142811797251321 is an frugal number, since it uses more digits than its factorization.

142811797251321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80514 (or 40251 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 54.

The spelling of 142811797251321 in words is "one hundred forty-two trillion, eight hundred eleven billion, seven hundred ninety-seven million, two hundred fifty-one thousand, three hundred twenty-one".