21941886402 has 24 divisors (see below), whose sum is σ = 47649064320. Its totient is φ = 7297299000.

The previous prime is 21941886389. The next prime is 21941886427. The reversal of 21941886402 is 20468814912.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1380474 + ... + 1396277.

It is an arithmetic number, because the mean of its divisors is an integer number (1985377680).

Almost surely, 2^21941886402 is an apocalyptic number.

21941886402 is an abundant number, since it is smaller than the sum of its proper divisors (25707177918).

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

21941886402 is a wasteful number, since it uses less digits than its factorization.

21941886402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777198 (or 2777195 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

It can be divided in two parts, 2194 and 1886402, that added together give a triangular number (1888596 = T₁₉₄₃).

The spelling of 21941886402 in words is "twenty-one billion, nine hundred forty-one million, eight hundred eighty-six thousand, four hundred two".