21310440442 has 16 divisors (see below), whose sum is σ = 32012431200. Its totient is φ = 10639644400.

The previous prime is 21310440433. The next prime is 21310440449. The reversal of 21310440442 is 24404401312.

It is not an unprimeable number, because it can be changed into a prime (21310440449) 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, 5531817 + ... + 5535667.

It is an arithmetic number, because the mean of its divisors is an integer number (2000776950).

Almost surely, 2^21310440442 is an apocalyptic number.

21310440442 is a deficient number, since it is larger than the sum of its proper divisors (10701990758).

21310440442 is a wasteful number, since it uses less digits than its factorization.

21310440442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7181.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21310440442 its reverse (24404401312), we get a palindrome (45714841754).

The spelling of 21310440442 in words is "twenty-one billion, three hundred ten million, four hundred forty thousand, four hundred forty-two".