21722150 has 24 divisors (see below), whose sum is σ = 40630584. Its totient is φ = 8640000.

The previous prime is 21722147. The next prime is 21722153. The reversal of 21722150 is 5122712.

It is an interprime number because it is at equal distance from previous prime (21722147) and next prime (21722153).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21722153) 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, 8525 + ... + 10775.

It is an arithmetic number, because the mean of its divisors is an integer number (1692941).

Almost surely, 2^21722150 is an apocalyptic number.

21722150 is a deficient number, since it is larger than the sum of its proper divisors (18908434).

21722150 is a wasteful number, since it uses less digits than its factorization.

21722150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2456 (or 2451 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 21722150 is about 4660.7027367126. The cubic root of 21722150 is about 279.0193158177.

Adding to 21722150 its reverse (5122712), we get a palindrome (26844862).

It can be divided in two parts, 217 and 22150, that multiplied together give a triangular number (4806550 = T₃₁₀₀).

The spelling of 21722150 in words is "twenty-one million, seven hundred twenty-two thousand, one hundred fifty".