21515410554452 has 12 divisors (see below), whose sum is σ = 39866790145140. Its totient is φ = 10124899084416.

The previous prime is 21515410554371. The next prime is 21515410554457. The reversal of 21515410554452 is 25445501451512.

It can be written as a sum of positive squares in 2 ways, for example, as 19882627492036 + 1632783062416 = 4458994^2 + 1277804^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21515410554457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158201548127 + ... + 158201548262.

It is an arithmetic number, because the mean of its divisors is an integer number (3322232512095).

Almost surely, 2^{21515410554452} is an apocalyptic number.

It is an amenable number.

21515410554452 is a deficient number, since it is larger than the sum of its proper divisors (18351379590688).

21515410554452 is a wasteful number, since it uses less digits than its factorization.

21515410554452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316403096410 (or 316403096408 counting only the distinct ones).

The product of its (nonzero) digits is 800000, while the sum is 44.

The spelling of 21515410554452 in words is "twenty-one trillion, five hundred fifteen billion, four hundred ten million, five hundred fifty-four thousand, four hundred fifty-two".