21221355320054 has 32 divisors (see below), whose sum is σ = 33080365412352. Its totient is φ = 10199197260000.

The previous prime is 21221355320047. The next prime is 21221355320063. The reversal of 21221355320054 is 45002355312212.

It is a junction number, because it is equal to n+sod(n) for n = 21221355319996 and 21221355320023.

It is a congruent number.

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, 82322444 + ... + 82579824.

It is an arithmetic number, because the mean of its divisors is an integer number (1033761419136).

Almost surely, 2^{21221355320054} is an apocalyptic number.

21221355320054 is a deficient number, since it is larger than the sum of its proper divisors (11859010092298).

21221355320054 is a wasteful number, since it uses less digits than its factorization.

21221355320054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266372.

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 21221355320054 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred fifty-five million, three hundred twenty thousand, fifty-four".