21490622040 has 64 divisors (see below), whose sum is σ = 64484294400. Its totient is φ = 5729727872.

The previous prime is 21490622017. The next prime is 21490622053. The reversal of 21490622040 is 4022609412.

It is a super-2 number, since 2×21490622040² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21490621989 and 21490622007.

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, 748999 + ... + 777161.

It is an arithmetic number, because the mean of its divisors is an integer number (1007567100).

Almost surely, 2^21490622040 is an apocalyptic number.

21490622040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21490622040 is an abundant number, since it is smaller than the sum of its proper divisors (42993672360).

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

21490622040 is a wasteful number, since it uses less digits than its factorization.

21490622040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34536 (or 34532 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The spelling of 21490622040 in words is "twenty-one billion, four hundred ninety million, six hundred twenty-two thousand, forty".