21131150415 has 24 divisors (see below), whose sum is σ = 34544558640. Its totient is φ = 11030143488.

The previous prime is 21131150407. The next prime is 21131150419. The reversal of 21131150415 is 51405113112.

It is not a de Polignac number, because 21131150415 - 2³ = 21131150407 is a prime.

It is a super-2 number, since 2×21131150415² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131150419) 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, 285730 + ... + 351999.

It is an arithmetic number, because the mean of its divisors is an integer number (1439356610).

Almost surely, 2^21131150415 is an apocalyptic number.

21131150415 is a deficient number, since it is larger than the sum of its proper divisors (13413408225).

21131150415 is an equidigital number, since it uses as much as digits as its factorization.

21131150415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637831 (or 637784 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 24.

Adding to 21131150415 its reverse (51405113112), we get a palindrome (72536263527).

It can be divided in two parts, 211311 and 50415, that added together give a triangular number (261726 = T₇₂₃).

The spelling of 21131150415 in words is "twenty-one billion, one hundred thirty-one million, one hundred fifty thousand, four hundred fifteen".