21326232974 has 4 divisors (see below), whose sum is σ = 31989349464. Its totient is φ = 10663116486.

The previous prime is 21326232973. The next prime is 21326233007. The reversal of 21326232974 is 47923262312.

It is a semiprime because it is the product of two primes.

It is a super-4 number, since 4×21326232974⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21326232973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5331558242 + ... + 5331558245.

It is an arithmetic number, because the mean of its divisors is an integer number (7997337366).

Almost surely, 2^21326232974 is an apocalyptic number.

21326232974 is a deficient number, since it is larger than the sum of its proper divisors (10663116490).

21326232974 is a wasteful number, since it uses less digits than its factorization.

21326232974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10663116489.

The product of its digits is 217728, while the sum is 41.

The spelling of 21326232974 in words is "twenty-one billion, three hundred twenty-six million, two hundred thirty-two thousand, nine hundred seventy-four".