21400622 has 4 divisors (see below), whose sum is σ = 32100936. Its totient is φ = 10700310.

The previous prime is 21400597. The next prime is 21400667. The reversal of 21400622 is 22600412.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21400622.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5350154 + ... + 5350157.

It is an arithmetic number, because the mean of its divisors is an integer number (8025234).

Almost surely, 2^21400622 is an apocalyptic number.

21400622 is a deficient number, since it is larger than the sum of its proper divisors (10700314).

21400622 is a wasteful number, since it uses less digits than its factorization.

21400622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10700313.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21400622 is about 4626.0806305122. The cubic root of 21400622 is about 277.6357996695.

It can be divided in two parts, 21400 and 622, that added together give a palindrome (22022).

The spelling of 21400622 in words is "twenty-one million, four hundred thousand, six hundred twenty-two".