21440031042 has 32 divisors (see below), whose sum is σ = 43447449600. Its totient is φ = 7052215248.

The previous prime is 21440031037. The next prime is 21440031043. The reversal of 21440031042 is 24013004412.

It is not an unprimeable number, because it can be changed into a prime (21440031043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 892059 + ... + 915777.

It is an arithmetic number, because the mean of its divisors is an integer number (1357732800).

Almost surely, 2^21440031042 is an apocalyptic number.

21440031042 is an abundant number, since it is smaller than the sum of its proper divisors (22007418558).

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

21440031042 is a wasteful number, since it uses less digits than its factorization.

21440031042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25710.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21440031042 its reverse (24013004412), we get a palindrome (45453035454).

The spelling of 21440031042 in words is "twenty-one billion, four hundred forty million, thirty-one thousand, forty-two".