21225158 has 12 divisors (see below), whose sum is σ = 32976060. Its totient is φ = 10245816.

The previous prime is 21225121. The next prime is 21225179. The reversal of 21225158 is 85152212.

It is a congruent 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, 4628 + ... + 7991.

It is an arithmetic number, because the mean of its divisors is an integer number (2748005).

Almost surely, 2^21225158 is an apocalyptic number.

21225158 is a deficient number, since it is larger than the sum of its proper divisors (11750902).

21225158 is a wasteful number, since it uses less digits than its factorization.

21225158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12679 (or 12650 counting only the distinct ones).

The product of its digits is 1600, while the sum is 26.

The square root of 21225158 is about 4607.0769474798. The cubic root of 21225158 is about 276.8749364837.

The spelling of 21225158 in words is "twenty-one million, two hundred twenty-five thousand, one hundred fifty-eight".