21431144002 has 16 divisors (see below), whose sum is σ = 32339142432. Its totient is φ = 10651578880.

The previous prime is 21431143999. The next prime is 21431144023. The reversal of 21431144002 is 20044113412.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 254193 + ... + 327835.

It is an arithmetic number, because the mean of its divisors is an integer number (2021196402).

Almost surely, 2^21431144002 is an apocalyptic number.

21431144002 is a deficient number, since it is larger than the sum of its proper divisors (10907998430).

21431144002 is a wasteful number, since it uses less digits than its factorization.

21431144002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74513.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21431144002 its reverse (20044113412), we get a palindrome (41475257414).

The spelling of 21431144002 in words is "twenty-one billion, four hundred thirty-one million, one hundred forty-four thousand, two".