21949929227 has 16 divisors (see below), whose sum is σ = 24343887360. Its totient is φ = 19697401152.

The previous prime is 21949929203. The next prime is 21949929263. The reversal of 21949929227 is 72292994912.

It is a cyclic number.

It is not a de Polignac number, because 21949929227 - 2⁶ = 21949929163 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21949920227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198818 + ... + 288839.

It is an arithmetic number, because the mean of its divisors is an integer number (1521492960).

Almost surely, 2^21949929227 is an apocalyptic number.

21949929227 is a deficient number, since it is larger than the sum of its proper divisors (2393958133).

21949929227 is a wasteful number, since it uses less digits than its factorization.

21949929227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487802.

The product of its digits is 2939328, while the sum is 56.

The spelling of 21949929227 in words is "twenty-one billion, nine hundred forty-nine million, nine hundred twenty-nine thousand, two hundred twenty-seven".