21961948885 has 8 divisors (see below), whose sum is σ = 26364455640. Its totient is φ = 17562814464.

The previous prime is 21961948873. The next prime is 21961948891. The reversal of 21961948885 is 58884916912.

It can be written as a sum of positive squares in 4 ways, for example, as 12341169 + 21949607716 = 3513^2 + 148154^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21961948885 - 2⁹ = 21961948373 is a prime.

It is a congruent number.

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, 828732 + ... + 854821.

It is an arithmetic number, because the mean of its divisors is an integer number (3295556955).

Almost surely, 2^21961948885 is an apocalyptic number.

It is an amenable number.

21961948885 is a deficient number, since it is larger than the sum of its proper divisors (4402506755).

21961948885 is a wasteful number, since it uses less digits than its factorization.

21961948885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686167.

The product of its digits is 9953280, while the sum is 61.

The spelling of 21961948885 in words is "twenty-one billion, nine hundred sixty-one million, nine hundred forty-eight thousand, eight hundred eighty-five".