21330431404516 has 192 divisors, whose sum is σ = 42084512870400. Its totient is φ = 9395456509440.

The previous prime is 21330431404507. The next prime is 21330431404549. The reversal of 21330431404516 is 61540413403312.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15246912385 + ... + 15246913783.

It is an arithmetic number, because the mean of its divisors is an integer number (219190171200).

Almost surely, 2^{21330431404516} is an apocalyptic number.

21330431404516 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21330431404516 is a deficient number, since it is larger than the sum of its proper divisors (20754081465884).

21330431404516 is a wasteful number, since it uses less digits than its factorization.

21330431404516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154 (or 2152 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

Adding to 21330431404516 its reverse (61540413403312), we get a palindrome (82870844807828).

The spelling of 21330431404516 in words is "twenty-one trillion, three hundred thirty billion, four hundred thirty-one million, four hundred four thousand, five hundred sixteen".