21945992270 has 16 divisors (see below), whose sum is σ = 39505026240. Its totient is φ = 8777899104.

The previous prime is 21945992269. The next prime is 21945992279. The reversal of 21945992270 is 7229954912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21945992279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161099 + ... + 264281.

It is an arithmetic number, because the mean of its divisors is an integer number (2469064140).

Almost surely, 2^21945992270 is an apocalyptic number.

21945992270 is a deficient number, since it is larger than the sum of its proper divisors (17559033970).

21945992270 is a wasteful number, since it uses less digits than its factorization.

21945992270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124459.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 21945992270 in words is "twenty-one billion, nine hundred forty-five million, nine hundred ninety-two thousand, two hundred seventy".