21712522 has 8 divisors (see below), whose sum is σ = 35074116. Its totient is φ = 10021152.

The previous prime is 21712513. The next prime is 21712541. The reversal of 21712522 is 22521712.

It can be written as a sum of positive squares in 2 ways, for example, as 21706281 + 6241 = 4659^2 + 79^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21712522² = 942867223200968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21712493 and 21712502.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 417523 + ... + 417574.

Almost surely, 2^21712522 is an apocalyptic number.

21712522 is a deficient number, since it is larger than the sum of its proper divisors (13361594).

21712522 is a wasteful number, since it uses less digits than its factorization.

21712522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835112.

The product of its digits is 560, while the sum is 22.

The square root of 21712522 is about 4659.6697307856. The cubic root of 21712522 is about 278.9780860903.

The spelling of 21712522 in words is "twenty-one million, seven hundred twelve thousand, five hundred twenty-two".