21313260946 has 4 divisors (see below), whose sum is σ = 31969891422. Its totient is φ = 10656630472.

The previous prime is 21313260931. The next prime is 21313260971. The reversal of 21313260946 is 64906231312.

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

It can be written as a sum of positive squares in only one way, i.e., 17333039025 + 3980221921 = 131655^2 + 63089^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5328315235 + ... + 5328315238.

Almost surely, 2^21313260946 is an apocalyptic number.

21313260946 is a deficient number, since it is larger than the sum of its proper divisors (10656630476).

21313260946 is a wasteful number, since it uses less digits than its factorization.

21313260946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10656630475.

The product of its (nonzero) digits is 46656, while the sum is 37.

The spelling of 21313260946 in words is "twenty-one billion, three hundred thirteen million, two hundred sixty thousand, nine hundred forty-six".