21197158023 has 8 divisors (see below), whose sum is σ = 28313620848. Its totient is φ = 14106066944.

The previous prime is 21197158001. The next prime is 21197158051. The reversal of 21197158023 is 32085179112.

It is a happy number.

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 21197158023 - 2¹⁴ = 21197141639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21197158063) 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, 6340986 + ... + 6344327.

It is an arithmetic number, because the mean of its divisors is an integer number (3539202606).

Almost surely, 2^21197158023 is an apocalyptic number.

21197158023 is a deficient number, since it is larger than the sum of its proper divisors (7116462825).

21197158023 is a wasteful number, since it uses less digits than its factorization.

21197158023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12685873.

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 21197158023 in words is "twenty-one billion, one hundred ninety-seven million, one hundred fifty-eight thousand, twenty-three".