11902521 has 4 divisors (see below), whose sum is σ = 15870032. Its totient is φ = 7935012.

The previous prime is 11902519. The next prime is 11902571. The reversal of 11902521 is 12520911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 11902521 - 2¹ = 11902519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11902571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1983751 + ... + 1983756.

It is an arithmetic number, because the mean of its divisors is an integer number (3967508).

Almost surely, 2^11902521 is an apocalyptic number.

It is an amenable number.

11902521 is a deficient number, since it is larger than the sum of its proper divisors (3967511).

11902521 is an equidigital number, since it uses as much as digits as its factorization.

11902521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3967510.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 11902521 is about 3450.0030434769. The cubic root of 11902521 is about 228.3212423076.

Subtracting from 11902521 its sum of digits (21), we obtain a square (11902500 = 3450²).

The spelling of 11902521 in words is "eleven million, nine hundred two thousand, five hundred twenty-one".