21152335155420 has 96 divisors (see below), whose sum is σ = 67698626300928. Its totient is φ = 4834022764032.

The previous prime is 21152335155409. The next prime is 21152335155433. The reversal of 21152335155420 is 2455153325112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1595784 + ... + 6697103.

It is an arithmetic number, because the mean of its divisors is an integer number (705194023968).

Almost surely, 2^{21152335155420} is an apocalyptic number.

21152335155420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21152335155420 is an abundant number, since it is smaller than the sum of its proper divisors (46546291145508).

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

21152335155420 is a wasteful number, since it uses less digits than its factorization.

21152335155420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8298979 (or 8298977 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 21152335155420 in words is "twenty-one trillion, one hundred fifty-two billion, three hundred thirty-five million, one hundred fifty-five thousand, four hundred twenty".