21614906 has 4 divisors (see below), whose sum is σ = 32422362. Its totient is φ = 10807452.

The previous prime is 21614899. The next prime is 21614911. The reversal of 21614906 is 60941612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19439281 + 2175625 = 4409^2 + 1475^2 .

It is a super-2 number, since 2×21614906² = 934408322777672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5403725 + ... + 5403728.

Almost surely, 2^21614906 is an apocalyptic number.

21614906 is a deficient number, since it is larger than the sum of its proper divisors (10807456).

21614906 is a wasteful number, since it uses less digits than its factorization.

21614906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10807455.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 21614906 is about 4649.1833691520. The cubic root of 21614906 is about 278.5593778075.

The spelling of 21614906 in words is "twenty-one million, six hundred fourteen thousand, nine hundred six".