21415551320 has 64 divisors (see below), whose sum is σ = 51958216800. Its totient is φ = 7917419520.

The previous prime is 21415551299. The next prime is 21415551331. The reversal of 21415551320 is 2315551412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312479 + ... + 374798.

Almost surely, 2^21415551320 is an apocalyptic number.

21415551320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21415551320 is an abundant number, since it is smaller than the sum of its proper divisors (30542665480).

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

21415551320 is a wasteful number, since it uses less digits than its factorization.

21415551320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687348 (or 687344 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 21415551320 in words is "twenty-one billion, four hundred fifteen million, five hundred fifty-one thousand, three hundred twenty".