21612362 has 4 divisors (see below), whose sum is σ = 32418546. Its totient is φ = 10806180.

The previous prime is 21612319. The next prime is 21612373. The reversal of 21612362 is 26321612.

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., 19175641 + 2436721 = 4379^2 + 1561^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5403089 + ... + 5403092.

Almost surely, 2^21612362 is an apocalyptic number.

21612362 is a deficient number, since it is larger than the sum of its proper divisors (10806184).

21612362 is a wasteful number, since it uses less digits than its factorization.

21612362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10806183.

The product of its digits is 864, while the sum is 23.

The square root of 21612362 is about 4648.9097646653. The cubic root of 21612362 is about 278.5484488856.

Adding to 21612362 its reverse (26321612), we get a palindrome (47933974).

The spelling of 21612362 in words is "twenty-one million, six hundred twelve thousand, three hundred sixty-two".