21400122210 has 16 divisors (see below), whose sum is σ = 51360293376. Its totient is φ = 5706699248.

The previous prime is 21400122187. The next prime is 21400122239. The reversal of 21400122210 is 1222100412.

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 21400122210.

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, 356668674 + ... + 356668733.

It is an arithmetic number, because the mean of its divisors is an integer number (3210018336).

Almost surely, 2^21400122210 is an apocalyptic number.

21400122210 is an abundant number, since it is smaller than the sum of its proper divisors (29960171166).

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

21400122210 is a wasteful number, since it uses less digits than its factorization.

21400122210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713337417.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21400122210 its reverse (1222100412), we get a palindrome (22622222622).

The spelling of 21400122210 in words is "twenty-one billion, four hundred million, one hundred twenty-two thousand, two hundred ten".