21353415040 has 64 divisors (see below), whose sum is σ = 52694766720. Its totient is φ = 8265830400.

The previous prime is 21353415023. The next prime is 21353415067. The reversal of 21353415040 is 4051435312.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518301 + ... + 557980.

It is an arithmetic number, because the mean of its divisors is an integer number (823355730).

Almost surely, 2^21353415040 is an apocalyptic number.

21353415040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21353415040 is an abundant number, since it is smaller than the sum of its proper divisors (31341351680).

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

21353415040 is a wasteful number, since it uses less digits than its factorization.

21353415040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076331 (or 1076319 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 21353415040 in words is "twenty-one billion, three hundred fifty-three million, four hundred fifteen thousand, forty".