21650531424 has 48 divisors (see below), whose sum is σ = 60175746288. Its totient is φ = 6792323072.

The previous prime is 21650531411. The next prime is 21650531431. The reversal of 21650531424 is 42413505612.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×21650531424² (a number of 21 digits) contains 22 as substring.

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, 6631497 + ... + 6634760.

It is an arithmetic number, because the mean of its divisors is an integer number (1253661381).

Almost surely, 2^21650531424 is an apocalyptic number.

21650531424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21650531424 is an abundant number, since it is smaller than the sum of its proper divisors (38525214864).

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

21650531424 is a wasteful number, since it uses less digits than its factorization.

21650531424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13266287 (or 13266279 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 21650531424 in words is "twenty-one billion, six hundred fifty million, five hundred thirty-one thousand, four hundred twenty-four".