21400682 has 8 divisors (see below), whose sum is σ = 32183076. Its totient is φ = 10672992.

The previous prime is 21400681. The next prime is 21400723. The reversal of 21400682 is 28600412.

It can be written as a sum of positive squares in 2 ways, for example, as 20693401 + 707281 = 4549^2 + 841^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21400681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12683 + ... + 14270.

Almost surely, 2^21400682 is an apocalyptic number.

21400682 is a deficient number, since it is larger than the sum of its proper divisors (10782394).

21400682 is a wasteful number, since it uses less digits than its factorization.

21400682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27352.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21400682 is about 4626.0871154789. The cubic root of 21400682 is about 277.6360591345.

The spelling of 21400682 in words is "twenty-one million, four hundred thousand, six hundred eighty-two".