21214036536452 has 24 divisors (see below), whose sum is σ = 37601224550400. Its totient is φ = 10471029363936.

The previous prime is 21214036536449. The next prime is 21214036536487. The reversal of 21214036536452 is 25463563041212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24554927 + ... + 25404182.

It is an arithmetic number, because the mean of its divisors is an integer number (1566717689600).

Almost surely, 2^{21214036536452} is an apocalyptic number.

It is an amenable number.

21214036536452 is a deficient number, since it is larger than the sum of its proper divisors (16387188013948).

21214036536452 is a wasteful number, since it uses less digits than its factorization.

21214036536452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49960475 (or 49960473 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 44.

Adding to 21214036536452 its reverse (25463563041212), we get a palindrome (46677599577664).

The spelling of 21214036536452 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, four hundred fifty-two".