21155014256342 has 16 divisors (see below), whose sum is σ = 31866012997200. Its totient is φ = 10533100828800.

The previous prime is 21155014256317. The next prime is 21155014256371. The reversal of 21155014256342 is 24365241055112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21155014256342.

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, 22260284 + ... + 23191167.

It is an arithmetic number, because the mean of its divisors is an integer number (1991625812325).

Almost surely, 2^{21155014256342} is an apocalyptic number.

21155014256342 is a deficient number, since it is larger than the sum of its proper divisors (10710998740858).

21155014256342 is a wasteful number, since it uses less digits than its factorization.

21155014256342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45452431.

The product of its (nonzero) digits is 288000, while the sum is 41.

The spelling of 21155014256342 in words is "twenty-one trillion, one hundred fifty-five billion, fourteen million, two hundred fifty-six thousand, three hundred forty-two".