21400710 has 16 divisors (see below), whose sum is σ = 51361776. Its totient is φ = 5706848.

The previous prime is 21400681. The next prime is 21400723. The reversal of 21400710 is 1700412.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21400710.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 356649 + ... + 356708.

It is an arithmetic number, because the mean of its divisors is an integer number (3210111).

Almost surely, 2^21400710 is an apocalyptic number.

21400710 is an abundant number, since it is smaller than the sum of its proper divisors (29961066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21400710 is a wasteful number, since it uses less digits than its factorization.

21400710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713367.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 21400710 is about 4626.0901417936. The cubic root of 21400710 is about 277.6361802179.

The spelling of 21400710 in words is "twenty-one million, four hundred thousand, seven hundred ten".