21243691206752 has 96 divisors (see below), whose sum is σ = 47878876362240. Its totient is φ = 9089096970240.

The previous prime is 21243691206713. The next prime is 21243691206791. The reversal of 21243691206752 is 25760219634212.

It is an interprime number because it is at equal distance from previous prime (21243691206713) and next prime (21243691206791).

It is a self number, because there is not a number n which added to its sum of digits gives 21243691206752.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1569298928 + ... + 1569312464.

It is an arithmetic number, because the mean of its divisors is an integer number (498738295440).

Almost surely, 2^{21243691206752} is an apocalyptic number.

It is an amenable number.

21243691206752 is an abundant number, since it is smaller than the sum of its proper divisors (26635185155488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21243691206752 is a wasteful number, since it uses less digits than its factorization.

21243691206752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24844 (or 24836 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 21243691206752 in words is "twenty-one trillion, two hundred forty-three billion, six hundred ninety-one million, two hundred six thousand, seven hundred fifty-two".