21152515331452 has 24 divisors (see below), whose sum is σ = 37065254876496. Its totient is φ = 10562448210048.

The previous prime is 21152515331429. The next prime is 21152515331483. The reversal of 21152515331452 is 25413351525112.

It is a congruent number.

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, 14183358 + ... + 15603610.

It is an arithmetic number, because the mean of its divisors is an integer number (1544385619854).

Almost surely, 2^{21152515331452} is an apocalyptic number.

It is an amenable number.

21152515331452 is a deficient number, since it is larger than the sum of its proper divisors (15912739545044).

21152515331452 is a wasteful number, since it uses less digits than its factorization.

21152515331452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425117 (or 1425115 counting only the distinct ones).

The product of its digits is 180000, while the sum is 40.

Adding to 21152515331452 its reverse (25413351525112), we get a palindrome (46565866856564).

The spelling of 21152515331452 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred fifteen million, three hundred thirty-one thousand, four hundred fifty-two".