21230465520451 has 24 divisors (see below), whose sum is σ = 24567111651600. Its totient is φ = 18282425515200.

The previous prime is 21230465520343. The next prime is 21230465520479. The reversal of 21230465520451 is 15402556403212.

It is not a de Polignac number, because 21230465520451 - 2¹⁵ = 21230465487683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21230465521451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18830481 + ... + 19926061.

It is an arithmetic number, because the mean of its divisors is an integer number (1023629652150).

Almost surely, 2^{21230465520451} is an apocalyptic number.

21230465520451 is a deficient number, since it is larger than the sum of its proper divisors (3336646131149).

21230465520451 is a wasteful number, since it uses less digits than its factorization.

21230465520451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104051 (or 1104040 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 21230465520451 in words is "twenty-one trillion, two hundred thirty billion, four hundred sixty-five million, five hundred twenty thousand, four hundred fifty-one".