21150006244 has 12 divisors (see below), whose sum is σ = 37107661500. Its totient is φ = 10547817248.

The previous prime is 21150006239. The next prime is 21150006257. The reversal of 21150006244 is 44260005112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3110292900 + 18039713344 = 55770^2 + 134312^2 .

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, 6794719 + ... + 6797830.

It is an arithmetic number, because the mean of its divisors is an integer number (3092305125).

Almost surely, 2^21150006244 is an apocalyptic number.

It is an amenable number.

21150006244 is a deficient number, since it is larger than the sum of its proper divisors (15957655256).

21150006244 is a wasteful number, since it uses less digits than its factorization.

21150006244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13592942 (or 13592940 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The spelling of 21150006244 in words is "twenty-one billion, one hundred fifty million, six thousand, two hundred forty-four".