21244966890 has 64 divisors (see below), whose sum is σ = 58448148480. Its totient is φ = 4841305920.

The previous prime is 21244966879. The next prime is 21244966909. The reversal of 21244966890 is 9866944212.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83310 + ... + 222329.

It is an arithmetic number, because the mean of its divisors is an integer number (913252320).

Almost surely, 2^21244966890 is an apocalyptic number.

21244966890 is an abundant number, since it is smaller than the sum of its proper divisors (37203181590).

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

21244966890 is a wasteful number, since it uses less digits than its factorization.

21244966890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305987.

The product of its (nonzero) digits is 1492992, while the sum is 51.

The spelling of 21244966890 in words is "twenty-one billion, two hundred forty-four million, nine hundred sixty-six thousand, eight hundred ninety".