21401004431115 has 128 divisors (see below), whose sum is σ = 40987860537600. Its totient is φ = 10555205713920.

The previous prime is 21401004431113. The next prime is 21401004431143. The reversal of 21401004431115 is 51113440010412.

It is a happy number.

21401004431115 is a `hidden beast` number, since 2 + 1 + 4 + 0 + 100 + 443 + 1 + 115 = 666.

It is not a de Polignac number, because 21401004431115 - 2¹ = 21401004431113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21401004431113) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 133335031 + ... + 133495439.

It is an arithmetic number, because the mean of its divisors is an integer number (320217660450).

Almost surely, 2^{21401004431115} is an apocalyptic number.

21401004431115 is a deficient number, since it is larger than the sum of its proper divisors (19586856106485).

21401004431115 is a wasteful number, since it uses less digits than its factorization.

21401004431115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161454 (or 161448 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 21401004431115 its reverse (51113440010412), we get a palindrome (72514444441527).

The spelling of 21401004431115 in words is "twenty-one trillion, four hundred one billion, four million, four hundred thirty-one thousand, one hundred fifteen".