21970990854 has 16 divisors (see below), whose sum is σ = 48824424240. Its totient is φ = 7323663600.

The previous prime is 21970990849. The next prime is 21970990891. The reversal of 21970990854 is 45809907912.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 406870201 = 21970990854 / (2 + 1 + 9 + 7 + 0 + 9 + 9 + 0 + 8 + 5 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 21970990854.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203435047 + ... + 203435154.

It is an arithmetic number, because the mean of its divisors is an integer number (3051526515).

Almost surely, 2^21970990854 is an apocalyptic number.

21970990854 is an abundant number, since it is smaller than the sum of its proper divisors (26853433386).

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

21970990854 is a wasteful number, since it uses less digits than its factorization.

21970990854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406870212 (or 406870206 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 21970990854 in words is "twenty-one billion, nine hundred seventy million, nine hundred ninety thousand, eight hundred fifty-four".