21797150 has 24 divisors (see below), whose sum is σ = 40738464. Its totient is φ = 8676800.

The previous prime is 21797131. The next prime is 21797159. The reversal of 21797150 is 5179712.

21797150 = T₁₃₀₈ + T₁₃₀₉ + ... + T₁₃₃₂.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21797159) 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, 10715 + ... + 12585.

It is an arithmetic number, because the mean of its divisors is an integer number (1697436).

Almost surely, 2^21797150 is an apocalyptic number.

21797150 is a deficient number, since it is larger than the sum of its proper divisors (18941314).

21797150 is a wasteful number, since it uses less digits than its factorization.

21797150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2116 (or 2111 counting only the distinct ones).

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 21797150 is about 4668.7418005283. The cubic root of 21797150 is about 279.3400699873.

The spelling of 21797150 in words is "twenty-one million, seven hundred ninety-seven thousand, one hundred fifty".