21115330661425 has 48 divisors (see below), whose sum is σ = 35154810698112. Its totient is φ = 12150280166400.

The previous prime is 21115330661413. The next prime is 21115330661437. The reversal of 21115330661425 is 52416603351112.

It is an interprime number because it is at equal distance from previous prime (21115330661413) and next prime (21115330661437).

It is not a de Polignac number, because 21115330661425 - 2¹⁵ = 21115330628657 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 421859704 + ... + 421909753.

It is an arithmetic number, because the mean of its divisors is an integer number (732391889544).

Almost surely, 2^{21115330661425} is an apocalyptic number.

21115330661425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21115330661425 is a deficient number, since it is larger than the sum of its proper divisors (14039480036687).

21115330661425 is a wasteful number, since it uses less digits than its factorization.

21115330661425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843769498 (or 843769493 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 21115330661425 in words is "twenty-one trillion, one hundred fifteen billion, three hundred thirty million, six hundred sixty-one thousand, four hundred twenty-five".