21315064365413 has 64 divisors (see below), whose sum is σ = 28329838387200. Its totient is φ = 15568917154560.

The previous prime is 21315064365409. The next prime is 21315064365451. The reversal of 21315064365413 is 31456346051312.

It is a happy number.

It is not a de Polignac number, because 21315064365413 - 2² = 21315064365409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21315064365313) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 154040528 + ... + 154178838.

It is an arithmetic number, because the mean of its divisors is an integer number (442653724800).

Almost surely, 2^{21315064365413} is an apocalyptic number.

21315064365413 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21315064365413 is a deficient number, since it is larger than the sum of its proper divisors (7014774021787).

21315064365413 is a wasteful number, since it uses less digits than its factorization.

21315064365413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140922.

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 21315064365413 in words is "twenty-one trillion, three hundred fifteen billion, sixty-four million, three hundred sixty-five thousand, four hundred thirteen".