21371532374 has 4 divisors (see below), whose sum is σ = 32057298564. Its totient is φ = 10685766186.

The previous prime is 21371532373. The next prime is 21371532379. The reversal of 21371532374 is 47323517312.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21371532373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5342883092 + ... + 5342883095.

It is an arithmetic number, because the mean of its divisors is an integer number (8014324641).

Almost surely, 2^21371532374 is an apocalyptic number.

21371532374 is a deficient number, since it is larger than the sum of its proper divisors (10685766190).

21371532374 is a wasteful number, since it uses less digits than its factorization.

21371532374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10685766189.

The product of its digits is 105840, while the sum is 38.

The spelling of 21371532374 in words is "twenty-one billion, three hundred seventy-one million, five hundred thirty-two thousand, three hundred seventy-four".