21450124310531 has 16 divisors (see below), whose sum is σ = 24974085631488. Its totient is φ = 18044011440000.

The previous prime is 21450124310519. The next prime is 21450124310533. The reversal of 21450124310531 is 13501342105412.

It is not a de Polignac number, because 21450124310531 - 2⁶ = 21450124310467 is a prime.

It is a super-2 number, since 2×21450124310531² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21450124310533) 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, 122161670 + ... + 122337131.

It is an arithmetic number, because the mean of its divisors is an integer number (1560880351968).

Almost surely, 2^{21450124310531} is an apocalyptic number.

21450124310531 is a deficient number, since it is larger than the sum of its proper divisors (3523961320957).

21450124310531 is a wasteful number, since it uses less digits than its factorization.

21450124310531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244499042.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21450124310531 its reverse (13501342105412), we get a palindrome (34951466415943).

The spelling of 21450124310531 in words is "twenty-one trillion, four hundred fifty billion, one hundred twenty-four million, three hundred ten thousand, five hundred thirty-one".