21653107554 has 32 divisors (see below), whose sum is σ = 46656187200. Its totient is φ = 6659819712.

The previous prime is 21653107543. The next prime is 21653107577. The reversal of 21653107554 is 45570135612.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144369 + ... + 253275.

It is an arithmetic number, because the mean of its divisors is an integer number (1458005850).

Almost surely, 2^21653107554 is an apocalyptic number.

21653107554 is an abundant number, since it is smaller than the sum of its proper divisors (25003079646).

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

21653107554 is a wasteful number, since it uses less digits than its factorization.

21653107554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111474.

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 21653107554 in words is "twenty-one billion, six hundred fifty-three million, one hundred seven thousand, five hundred fifty-four".