21513010452351 has 16 divisors (see below), whose sum is σ = 32652158158080. Its totient is φ = 12471310406720.

The previous prime is 21513010452341. The next prime is 21513010452383. The reversal of 21513010452351 is 15325401031512.

It is not a de Polignac number, because 21513010452351 - 2²² = 21513006258047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513010452301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14171942886 + ... + 14171944403.

It is an arithmetic number, because the mean of its divisors is an integer number (2040759884880).

Almost surely, 2^{21513010452351} is an apocalyptic number.

21513010452351 is a deficient number, since it is larger than the sum of its proper divisors (11139147705729).

21513010452351 is a wasteful number, since it uses less digits than its factorization.

21513010452351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28343887326.

The product of its (nonzero) digits is 18000, while the sum is 33.

Adding to 21513010452351 its reverse (15325401031512), we get a palindrome (36838411483863).

The spelling of 21513010452351 in words is "twenty-one trillion, five hundred thirteen billion, ten million, four hundred fifty-two thousand, three hundred fifty-one".