21150023635643 has 8 divisors (see below), whose sum is σ = 24331531449600. Its totient is φ = 18008534788200.

The previous prime is 21150023635639. The next prime is 21150023635649. The reversal of 21150023635643 is 34653632005112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21150023635643 - 2² = 21150023635639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21150023635643.

It is not an unprimeable number, because it can be changed into a prime (21150023635649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10004740493 + ... + 10004742606.

It is an arithmetic number, because the mean of its divisors is an integer number (3041441431200).

Almost surely, 2^{21150023635643} is an apocalyptic number.

21150023635643 is a deficient number, since it is larger than the sum of its proper divisors (3181507813957).

21150023635643 is a wasteful number, since it uses less digits than its factorization.

21150023635643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20009483257.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 21150023635643 in words is "twenty-one trillion, one hundred fifty billion, twenty-three million, six hundred thirty-five thousand, six hundred forty-three".