21949929228 has 24 divisors (see below), whose sum is σ = 51980928832. Its totient is φ = 7207439184.

The previous prime is 21949929203. The next prime is 21949929263. The reversal of 21949929228 is 82292994912.

It is a super-2 number, since 2×21949929228² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13649650 + ... + 13651257.

Almost surely, 2^21949929228 is an apocalyptic number.

It is an amenable number.

21949929228 is an abundant number, since it is smaller than the sum of its proper divisors (30030999604).

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

21949929228 is a wasteful number, since it uses less digits than its factorization.

21949929228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27300981 (or 27300979 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 57.

The spelling of 21949929228 in words is "twenty-one billion, nine hundred forty-nine million, nine hundred twenty-nine thousand, two hundred twenty-eight".