21498322692 has 192 divisors, whose sum is σ = 66037708800. Its totient is φ = 5273579520.

The previous prime is 21498322661. The next prime is 21498322697. The reversal of 21498322692 is 29622389412.

It is not an unprimeable number, because it can be changed into a prime (21498322697) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6195534 + ... + 6199002.

It is an arithmetic number, because the mean of its divisors is an integer number (343946400).

Almost surely, 2^21498322692 is an apocalyptic number.

21498322692 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21498322692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33018854400).

21498322692 is an abundant number, since it is smaller than the sum of its proper divisors (44539386108).

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

21498322692 is a wasteful number, since it uses less digits than its factorization.

21498322692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3866 (or 3864 counting only the distinct ones).

The product of its digits is 746496, while the sum is 48.

The spelling of 21498322692 in words is "twenty-one billion, four hundred ninety-eight million, three hundred twenty-two thousand, six hundred ninety-two".