21969791042 has 8 divisors (see below), whose sum is σ = 33758459532. Its totient is φ = 10716971200.

The previous prime is 21969791009. The next prime is 21969791057. The reversal of 21969791042 is 24019796912.

It can be written as a sum of positive squares in 2 ways, for example, as 21641057881 + 328733161 = 147109^2 + 18131^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133962059 + ... + 133962222.

Almost surely, 2^21969791042 is an apocalyptic number.

21969791042 is a deficient number, since it is larger than the sum of its proper divisors (11788668490).

21969791042 is a wasteful number, since it uses less digits than its factorization.

21969791042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267924324.

The product of its (nonzero) digits is 489888, while the sum is 50.

The spelling of 21969791042 in words is "twenty-one billion, nine hundred sixty-nine million, seven hundred ninety-one thousand, forty-two".