21420041156 has 24 divisors (see below), whose sum is σ = 38374252224. Its totient is φ = 10456195680.

The previous prime is 21420041129. The next prime is 21420041171. The reversal of 21420041156 is 65114002412.

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, 367241 + ... + 421551.

It is an arithmetic number, because the mean of its divisors is an integer number (1598927176).

Almost surely, 2^21420041156 is an apocalyptic number.

It is an amenable number.

21420041156 is a deficient number, since it is larger than the sum of its proper divisors (16954211068).

21420041156 is a wasteful number, since it uses less digits than its factorization.

21420041156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56651 (or 56649 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 21420041156 its reverse (65114002412), we get a palindrome (86534043568).

The spelling of 21420041156 in words is "twenty-one billion, four hundred twenty million, forty-one thousand, one hundred fifty-six".