21515414332433 has 12 divisors (see below), whose sum is σ = 25225206976512. Its totient is φ = 18296572812840.

The previous prime is 21515414332409. The next prime is 21515414332459. The reversal of 21515414332433 is 33423341451512.

It is not a de Polignac number, because 21515414332433 - 2⁶ = 21515414332369 is a prime.

It is a super-4 number, since 4×21515414332433⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21515414338433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1728694913 + ... + 1728707358.

It is an arithmetic number, because the mean of its divisors is an integer number (2102100581376).

Almost surely, 2^{21515414332433} is an apocalyptic number.

It is an amenable number.

21515414332433 is a deficient number, since it is larger than the sum of its proper divisors (3709792644079).

21515414332433 is a wasteful number, since it uses less digits than its factorization.

21515414332433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3457402412 (or 3457402405 counting only the distinct ones).

The product of its digits is 518400, while the sum is 41.

Adding to 21515414332433 its reverse (33423341451512), we get a palindrome (54938755783945).

The spelling of 21515414332433 in words is "twenty-one trillion, five hundred fifteen billion, four hundred fourteen million, three hundred thirty-two thousand, four hundred thirty-three".