21231204402342 has 16 divisors (see below), whose sum is σ = 46322627787072. Its totient is φ = 6433698303720.

The previous prime is 21231204402329. The next prime is 21231204402389. The reversal of 21231204402342 is 24320440213212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160842457528 + ... + 160842457659.

It is an arithmetic number, because the mean of its divisors is an integer number (2895164236692).

Almost surely, 2^{21231204402342} is an apocalyptic number.

21231204402342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21231204402342 is an abundant number, since it is smaller than the sum of its proper divisors (25091423384730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21231204402342 is a wasteful number, since it uses less digits than its factorization.

21231204402342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321684915203.

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 21231204402342 its reverse (24320440213212), we get a palindrome (45551644615554).

The spelling of 21231204402342 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred four million, four hundred two thousand, three hundred forty-two".