21091343465115 has 96 divisors (see below), whose sum is σ = 46221176282112. Its totient is φ = 8641779552000.

The previous prime is 21091343465111. The next prime is 21091343465131. The reversal of 21091343465115 is 51156434319012.

21091343465115 is a `hidden beast` number, since 2 + 1 + 0 + 91 + 3 + 4 + 3 + 46 + 511 + 5 = 666.

It is not a de Polignac number, because 21091343465115 - 2² = 21091343465111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (21091343465111) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 42619956 + ... + 43111985.

It is an arithmetic number, because the mean of its divisors is an integer number (481470586272).

Almost surely, 2^{21091343465115} is an apocalyptic number.

21091343465115 is an abundant number, since it is smaller than the sum of its proper divisors (25129832816997).

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

21091343465115 is a wasteful number, since it uses less digits than its factorization.

21091343465115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85732041 (or 85732038 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 21091343465115 in words is "twenty-one trillion, ninety-one billion, three hundred forty-three million, four hundred sixty-five thousand, one hundred fifteen".