21949563337 has 18 divisors (see below), whose sum is σ = 23916179598. Its totient is φ = 20135486592.

The previous prime is 21949563331. The next prime is 21949563347. The reversal of 21949563337 is 73336594912.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 985708816 + 20963854521 = 31396^2 + 144789^2 .

It is not a de Polignac number, because 21949563337 - 2²⁷ = 21815345609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21949563331) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4710913 + ... + 4715569.

Almost surely, 2^21949563337 is an apocalyptic number.

It is an amenable number.

21949563337 is a deficient number, since it is larger than the sum of its proper divisors (1966616261).

21949563337 is an equidigital number, since it uses as much as digits as its factorization.

21949563337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5017 (or 4837 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 52.

The spelling of 21949563337 in words is "twenty-one billion, nine hundred forty-nine million, five hundred sixty-three thousand, three hundred thirty-seven".