21512601474225 has 12 divisors (see below), whose sum is σ = 35567501104176. Its totient is φ = 11473387452880.

The previous prime is 21512601474209. The next prime is 21512601474241. The reversal of 21512601474225 is 52247410621512.

It is an interprime number because it is at equal distance from previous prime (21512601474209) and next prime (21512601474241).

It is not a de Polignac number, because 21512601474225 - 2⁴ = 21512601474209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143417343087 + ... + 143417343236.

It is an arithmetic number, because the mean of its divisors is an integer number (2963958425348).

Almost surely, 2^{21512601474225} is an apocalyptic number.

21512601474225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21512601474225 is a deficient number, since it is larger than the sum of its proper divisors (14054899629951).

21512601474225 is a wasteful number, since it uses less digits than its factorization.

21512601474225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286834686336 (or 286834686331 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 42.

The spelling of 21512601474225 in words is "twenty-one trillion, five hundred twelve billion, six hundred one million, four hundred seventy-four thousand, two hundred twenty-five".