213507138225 has 36 divisors (see below), whose sum is σ = 374984570384. Its totient is φ = 107172199680.

The previous prime is 213507138193. The next prime is 213507138227. The reversal of 213507138225 is 522831705312.

It is not a de Polignac number, because 213507138225 - 2⁵ = 213507138193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213507138227) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4903519 + ... + 4946868.

Almost surely, 2^213507138225 is an apocalyptic number.

213507138225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

213507138225 is a deficient number, since it is larger than the sum of its proper divisors (161477432159).

213507138225 is a wasteful number, since it uses less digits than its factorization.

213507138225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9850434 (or 9850412 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 213507138225 in words is "two hundred thirteen billion, five hundred seven million, one hundred thirty-eight thousand, two hundred twenty-five".