21256016054226 has 16 divisors (see below), whose sum is σ = 43110793124928. Its totient is φ = 6985545182000.

The previous prime is 21256016054209. The next prime is 21256016054227. The reversal of 21256016054226 is 62245061065212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21256016054227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24948375225 + ... + 24948376076.

It is an arithmetic number, because the mean of its divisors is an integer number (2694424570308).

Almost surely, 2^{21256016054226} is an apocalyptic number.

21256016054226 is an abundant number, since it is smaller than the sum of its proper divisors (21854777070702).

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

21256016054226 is a wasteful number, since it uses less digits than its factorization.

21256016054226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49896751377.

The product of its (nonzero) digits is 345600, while the sum is 42.

The spelling of 21256016054226 in words is "twenty-one trillion, two hundred fifty-six billion, sixteen million, fifty-four thousand, two hundred twenty-six".