21402120010 has 48 divisors (see below), whose sum is σ = 39393497088. Its totient is φ = 8371308960.

The previous prime is 21402119951. The next prime is 21402120013. The reversal of 21402120010 is 1002120412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21402120013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6400399 + ... + 6403741.

It is an arithmetic number, because the mean of its divisors is an integer number (820697856).

Almost surely, 2^21402120010 is an apocalyptic number.

21402120010 is a deficient number, since it is larger than the sum of its proper divisors (17991377078).

21402120010 is a wasteful number, since it uses less digits than its factorization.

21402120010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3619 (or 3548 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21402120010 its reverse (1002120412), we get a palindrome (22404240422).

The spelling of 21402120010 in words is "twenty-one billion, four hundred two million, one hundred twenty thousand, ten".