21950331908 has 6 divisors (see below), whose sum is σ = 38413080846. Its totient is φ = 10975165952.

The previous prime is 21950331817. The next prime is 21950331929. The reversal of 21950331908 is 80913305912.

It can be written as a sum of positive squares in only one way, i.e., 11818298944 + 10132032964 = 108712^2 + 100658^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2743791485 + ... + 2743791492.

It is an arithmetic number, because the mean of its divisors is an integer number (6402180141).

Almost surely, 2^21950331908 is an apocalyptic number.

It is an amenable number.

21950331908 is a deficient number, since it is larger than the sum of its proper divisors (16462748938).

21950331908 is a wasteful number, since it uses less digits than its factorization.

21950331908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5487582981 (or 5487582979 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 41.

The spelling of 21950331908 in words is "twenty-one billion, nine hundred fifty million, three hundred thirty-one thousand, nine hundred eight".