21949050402 has 12 divisors (see below), whose sum is σ = 47556275910. Its totient is φ = 7316350128.

The previous prime is 21949050367. The next prime is 21949050437. The reversal of 21949050402 is 20405094912.

It is an interprime number because it is at equal distance from previous prime (21949050367) and next prime (21949050437).

It can be written as a sum of positive squares in only one way, i.e., 19549912041 + 2399138361 = 139821^2 + 48981^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 609695827 + ... + 609695862.

Almost surely, 2^21949050402 is an apocalyptic number.

21949050402 is an abundant number, since it is smaller than the sum of its proper divisors (25607225508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21949050402 is a wasteful number, since it uses less digits than its factorization.

21949050402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219391697 (or 1219391694 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 21949050402 in words is "twenty-one billion, nine hundred forty-nine million, fifty thousand, four hundred two".