21163316240420 has 24 divisors (see below), whose sum is σ = 44978421507264. Its totient is φ = 8363334610016.

The previous prime is 21163316240411. The next prime is 21163316240431. The reversal of 21163316240420 is 2404261336112.

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, 6374491184 + ... + 6374494503.

It is an arithmetic number, because the mean of its divisors is an integer number (1874100896136).

Almost surely, 2^{21163316240420} is an apocalyptic number.

21163316240420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21163316240420 is an abundant number, since it is smaller than the sum of its proper divisors (23815105266844).

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

21163316240420 is a wasteful number, since it uses less digits than its factorization.

21163316240420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12748985779 (or 12748985777 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

Adding to 21163316240420 its reverse (2404261336112), we get a palindrome (23567577576532).

The spelling of 21163316240420 in words is "twenty-one trillion, one hundred sixty-three billion, three hundred sixteen million, two hundred forty thousand, four hundred twenty".