1321404142155 has 16 divisors (see below), whose sum is σ = 2136042986784. Its totient is φ = 697483422720.

The previous prime is 1321404142087. The next prime is 1321404142181. The reversal of 1321404142155 is 5512414041231.

It is not a de Polignac number, because 1321404142155 - 2²² = 1321399947851 is a prime.

It is a super-2 number, since 2×1321404142155² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 454089316 + ... + 454092225.

It is an arithmetic number, because the mean of its divisors is an integer number (133502686674).

Almost surely, 2^{1321404142155} is an apocalyptic number.

1321404142155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1321404142155 is a deficient number, since it is larger than the sum of its proper divisors (814638844629).

1321404142155 is an equidigital number, since it uses as much as digits as its factorization.

1321404142155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908181646.

The product of its (nonzero) digits is 19200, while the sum is 33.

Adding to 1321404142155 its reverse (5512414041231), we get a palindrome (6833818183386).

The spelling of 1321404142155 in words is "one trillion, three hundred twenty-one billion, four hundred four million, one hundred forty-two thousand, one hundred fifty-five".