21961948886 has 4 divisors (see below), whose sum is σ = 32942923332. Its totient is φ = 10980974442.

The previous prime is 21961948873. The next prime is 21961948891. The reversal of 21961948886 is 68884916912.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5490487220 + ... + 5490487223.

It is an arithmetic number, because the mean of its divisors is an integer number (8235730833).

Almost surely, 2^21961948886 is an apocalyptic number.

21961948886 is a deficient number, since it is larger than the sum of its proper divisors (10980974446).

21961948886 is a wasteful number, since it uses less digits than its factorization.

21961948886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10980974445.

The product of its digits is 11943936, while the sum is 62.

The spelling of 21961948886 in words is "twenty-one billion, nine hundred sixty-one million, nine hundred forty-eight thousand, eight hundred eighty-six".