21121654224 has 40 divisors (see below), whose sum is σ = 59524663392. Its totient is φ = 6400501120.

The previous prime is 21121654219. The next prime is 21121654241. The reversal of 21121654224 is 42245612112.

It is a super-2 number, since 2×21121654224² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121654191 and 21121654200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20001039 + ... + 20002094.

Almost surely, 2^21121654224 is an apocalyptic number.

21121654224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21121654224 is an abundant number, since it is smaller than the sum of its proper divisors (38403009168).

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

21121654224 is a wasteful number, since it uses less digits than its factorization.

21121654224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40003155 (or 40003149 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

The spelling of 21121654224 in words is "twenty-one billion, one hundred twenty-one million, six hundred fifty-four thousand, two hundred twenty-four".