21402684386898 has 16 divisors (see below), whose sum is σ = 42805490059200. Its totient is φ = 7134207914736.

The previous prime is 21402684386887. The next prime is 21402684386911. The reversal of 21402684386898 is 89868348620412.

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, 2673265 + ... + 7067652.

It is an arithmetic number, because the mean of its divisors is an integer number (2675343128700).

Almost surely, 2^{21402684386898} is an apocalyptic number.

21402684386898 is an abundant number, since it is smaller than the sum of its proper divisors (21402805672302).

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

21402684386898 is a wasteful number, since it uses less digits than its factorization.

21402684386898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10107121.

The product of its (nonzero) digits is 254803968, while the sum is 69.

The spelling of 21402684386898 in words is "twenty-one trillion, four hundred two billion, six hundred eighty-four million, three hundred eighty-six thousand, eight hundred ninety-eight".