21065151078426 has 64 divisors (see below), whose sum is σ = 53058555906048. Its totient is φ = 5426443205568.

The previous prime is 21065151078421. The next prime is 21065151078443. The reversal of 21065151078426 is 62487015156012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21065151078421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 448591206 + ... + 448638161.

It is an arithmetic number, because the mean of its divisors is an integer number (829039936032).

Almost surely, 2^{21065151078426} is an apocalyptic number.

21065151078426 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21065151078426 is an abundant number, since it is smaller than the sum of its proper divisors (31993404827622).

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

21065151078426 is a wasteful number, since it uses less digits than its factorization.

21065151078426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897229435.

The product of its (nonzero) digits is 806400, while the sum is 48.

The spelling of 21065151078426 in words is "twenty-one trillion, sixty-five billion, one hundred fifty-one million, seventy-eight thousand, four hundred twenty-six".