21902132070 has 384 divisors, whose sum is σ = 75811147776. Its totient is φ = 4255469568.

The previous prime is 21902132051. The next prime is 21902132089. The reversal of 21902132070 is 7023120912.

It is an interprime number because it is at equal distance from previous prime (21902132051) and next prime (21902132089).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 6542137 + ... + 6545483.

It is an arithmetic number, because the mean of its divisors is an integer number (197424864).

Almost surely, 2^21902132070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21902132070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37905573888).

21902132070 is an abundant number, since it is smaller than the sum of its proper divisors (53909015706).

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

21902132070 is a wasteful number, since it uses less digits than its factorization.

21902132070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3444 (or 3441 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

Adding to 21902132070 its reverse (7023120912), we get a palindrome (28925252982).

The spelling of 21902132070 in words is "twenty-one billion, nine hundred two million, one hundred thirty-two thousand, seventy".