21122655654 has 32 divisors (see below), whose sum is σ = 42456960000. Its totient is φ = 7005700064.

The previous prime is 21122655637. The next prime is 21122655707. The reversal of 21122655654 is 45655622112.

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, 967147 + ... + 988745.

It is an arithmetic number, because the mean of its divisors is an integer number (1326780000).

Almost surely, 2^21122655654 is an apocalyptic number.

21122655654 is an abundant number, since it is smaller than the sum of its proper divisors (21334304346).

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

21122655654 is a wasteful number, since it uses less digits than its factorization.

21122655654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22412.

The product of its digits is 144000, while the sum is 39.

The spelling of 21122655654 in words is "twenty-one billion, one hundred twenty-two million, six hundred fifty-five thousand, six hundred fifty-four".