21980691414 has 64 divisors (see below), whose sum is σ = 53565788160. Its totient is φ = 6625908000.

The previous prime is 21980691379. The next prime is 21980691427. The reversal of 21980691414 is 41419608912.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21980691414.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16584 + ... + 210324.

It is an arithmetic number, because the mean of its divisors is an integer number (836965440).

Almost surely, 2^21980691414 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21980691414, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26782894080).

21980691414 is an abundant number, since it is smaller than the sum of its proper divisors (31585096746).

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

21980691414 is a wasteful number, since it uses less digits than its factorization.

21980691414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193954 (or 193948 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 21980691414 in words is "twenty-one billion, nine hundred eighty million, six hundred ninety-one thousand, four hundred fourteen".