21612520075075 has 6 divisors (see below), whose sum is σ = 26799524893124. Its totient is φ = 17290016060040.

The previous prime is 21612520075063. The next prime is 21612520075127. The reversal of 21612520075075 is 57057002521612.

It is not a de Polignac number, because 21612520075075 - 2¹³ = 21612520066883 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 432250401477 + ... + 432250401526.

Almost surely, 2^{21612520075075} is an apocalyptic number.

21612520075075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21612520075075 is a deficient number, since it is larger than the sum of its proper divisors (5187004818049).

21612520075075 is an equidigital number, since it uses as much as digits as its factorization.

21612520075075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864500803013 (or 864500803008 counting only the distinct ones).

The product of its (nonzero) digits is 294000, while the sum is 43.

Adding to 21612520075075 its reverse (57057002521612), we get a palindrome (78669522596687).

The spelling of 21612520075075 in words is "twenty-one trillion, six hundred twelve billion, five hundred twenty million, seventy-five thousand, seventy-five".