21980849061 has 8 divisors (see below), whose sum is σ = 29309316544. Its totient is φ = 14653140480.

The previous prime is 21980849039. The next prime is 21980849089. The reversal of 21980849061 is 16094808912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21980849061 - 2⁶ = 21980848997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21980849061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21980849161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118300 + ... + 240741.

It is an arithmetic number, because the mean of its divisors is an integer number (3663664568).

Almost surely, 2^21980849061 is an apocalyptic number.

It is an amenable number.

21980849061 is a deficient number, since it is larger than the sum of its proper divisors (7328467483).

21980849061 is a wasteful number, since it uses less digits than its factorization.

21980849061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379451.

The product of its (nonzero) digits is 248832, while the sum is 48.

The spelling of 21980849061 in words is "twenty-one billion, nine hundred eighty million, eight hundred forty-nine thousand, sixty-one".