21244440210 has 64 divisors (see below), whose sum is σ = 58480987392. Its totient is φ = 4838328576.

The previous prime is 21244440193. The next prime is 21244440211. The reversal of 21244440210 is 1204444212.

It is not an unprimeable number, because it can be changed into a prime (21244440211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124437 + ... + 240776.

It is an arithmetic number, because the mean of its divisors is an integer number (913765428).

Almost surely, 2^21244440210 is an apocalyptic number.

21244440210 is an abundant number, since it is smaller than the sum of its proper divisors (37236547182).

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

21244440210 is a wasteful number, since it uses less digits than its factorization.

21244440210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365507.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21244440210 its reverse (1204444212), we get a palindrome (22448884422).

The spelling of 21244440210 in words is "twenty-one billion, two hundred forty-four million, four hundred forty thousand, two hundred ten".