21320532371 has 4 divisors (see below), whose sum is σ = 22574681352. Its totient is φ = 20066383392.

The previous prime is 21320532361. The next prime is 21320532383. The reversal of 21320532371 is 17323502312.

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

It is a cyclic number.

It is not a de Polignac number, because 21320532371 - 2⁶ = 21320532307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21320532361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627074465 + ... + 627074498.

It is an arithmetic number, because the mean of its divisors is an integer number (5643670338).

Almost surely, 2^21320532371 is an apocalyptic number.

21320532371 is a deficient number, since it is larger than the sum of its proper divisors (1254148981).

21320532371 is a wasteful number, since it uses less digits than its factorization.

21320532371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254148980.

The product of its (nonzero) digits is 7560, while the sum is 29.

The spelling of 21320532371 in words is "twenty-one billion, three hundred twenty million, five hundred thirty-two thousand, three hundred seventy-one".