15225021 has 12 divisors (see below), whose sum is σ = 25133472. Its totient is φ = 8699976.

The previous prime is 15224983. The next prime is 15225031. The reversal of 15225021 is 12052251.

15225021 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15225021 - 2¹⁴ = 15208637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15224985 and 15225003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15225031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120771 + ... + 120896.

It is an arithmetic number, because the mean of its divisors is an integer number (2094456).

Almost surely, 2^15225021 is an apocalyptic number.

It is an amenable number.

15225021 is a deficient number, since it is larger than the sum of its proper divisors (9908451).

15225021 is a wasteful number, since it uses less digits than its factorization.

15225021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241680 (or 241677 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 15225021 is about 3901.9252940055. The cubic root of 15225021 is about 247.8483127644.

Adding to 15225021 its reverse (12052251), we get a palindrome (27277272).

The spelling of 15225021 in words is "fifteen million, two hundred twenty-five thousand, twenty-one".