21739942899 has 24 divisors (see below), whose sum is σ = 33141288960. Its totient is φ = 13694599152.

The previous prime is 21739942897. The next prime is 21739942943. The reversal of 21739942899 is 99824993712.

21739942899 is a `hidden beast` number, since 217 + 399 + 4 + 28 + 9 + 9 = 666.

It is not a de Polignac number, because 21739942899 - 2¹ = 21739942897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21739942897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100479 + ... + 231464.

It is an arithmetic number, because the mean of its divisors is an integer number (1380887040).

Almost surely, 2^21739942899 is an apocalyptic number.

21739942899 is a deficient number, since it is larger than the sum of its proper divisors (11401346061).

21739942899 is a wasteful number, since it uses less digits than its factorization.

21739942899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332351 (or 332348 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 63.

The spelling of 21739942899 in words is "twenty-one billion, seven hundred thirty-nine million, nine hundred forty-two thousand, eight hundred ninety-nine".