21152515325340 has 96 divisors (see below), whose sum is σ = 67689186937344. Its totient is φ = 4834779367680.

The previous prime is 21152515325327. The next prime is 21152515325353. The reversal of 21152515325340 is 4352351525112.

It is an interprime number because it is at equal distance from previous prime (21152515325327) and next prime (21152515325353).

It is a super-2 number, since 2×21152515325340² (a number of 27 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 31 ways as a sum of consecutive naturals, for example, 26648887 + ... + 27431153.

It is an arithmetic number, because the mean of its divisors is an integer number (705095697264).

Almost surely, 2^{21152515325340} is an apocalyptic number.

21152515325340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21152515325340 is an abundant number, since it is smaller than the sum of its proper divisors (46536671612004).

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

21152515325340 is a wasteful number, since it uses less digits than its factorization.

21152515325340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846667 (or 846665 counting only the distinct ones).

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

The spelling of 21152515325340 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred fifteen million, three hundred twenty-five thousand, three hundred forty".