21120153662044 has 12 divisors (see below), whose sum is σ = 36960454006168. Its totient is φ = 10560023946000.

The previous prime is 21120153661991. The next prime is 21120153662123. The reversal of 21120153662044 is 44026635102112.

It is a junction number, because it is equal to n+sod(n) for n = 21120153661994 and 21120153662012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12315807 + ... + 13925494.

Almost surely, 2^{21120153662044} is an apocalyptic number.

It is an amenable number.

21120153662044 is a deficient number, since it is larger than the sum of its proper divisors (15840300344124).

21120153662044 is a wasteful number, since it uses less digits than its factorization.

21120153662044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26442516 (or 26442514 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

Adding to 21120153662044 its reverse (44026635102112), we get a palindrome (65146788764156).

The spelling of 21120153662044 in words is "twenty-one trillion, one hundred twenty billion, one hundred fifty-three million, six hundred sixty-two thousand, forty-four".