21906362 has 4 divisors (see below), whose sum is σ = 32859546. Its totient is φ = 10953180.

The previous prime is 21906359. The next prime is 21906377. The reversal of 21906362 is 26360912.

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., 13256881 + 8649481 = 3641^2 + 2941^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5476589 + ... + 5476592.

Almost surely, 2^21906362 is an apocalyptic number.

21906362 is a deficient number, since it is larger than the sum of its proper divisors (10953184).

21906362 is a wasteful number, since it uses less digits than its factorization.

21906362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10953183.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 21906362 is about 4680.4232714574. The cubic root of 21906362 is about 279.8058262603.

The spelling of 21906362 in words is "twenty-one million, nine hundred six thousand, three hundred sixty-two".