142061901921 has 15 divisors (see below), whose sum is σ = 212220995041. Its totient is φ = 94705673148.

The previous prime is 142061901889. The next prime is 142061901953. The reversal of 142061901921 is 129109160241.

It is a happy number.

The square root of 142061901921 is 376911.

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

142061901921 is a `hidden beast` number, since 1 + 4 + 2 + 0 + 619 + 0 + 19 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (142061901889) and next prime (142061901953).

It is not a de Polignac number, because 142061901921 - 2⁵ = 142061901889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (142061901991) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 3371260 + ... + 3413138.

Almost surely, 2^142061901921 is an apocalyptic number.

142061901921 is the 376911-st square number.

142061901921 is the 188456-th centered octagonal number.

It is an amenable number.

142061901921 is a deficient number, since it is larger than the sum of its proper divisors (70159093120).

142061901921 is an frugal number, since it uses more digits than its factorization.

142061901921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83770 (or 41882 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

Multiplying 142061901921 by its sum of digits (36), we get a square (5114228469156 = 2261466²).

The spelling of 142061901921 in words is "one hundred forty-two billion, sixty-one million, nine hundred one thousand, nine hundred twenty-one".