21939369270 has 192 divisors, whose sum is σ = 67499308800. Its totient is φ = 4521146112.

The previous prime is 21939369269. The next prime is 21939369289. The reversal of 21939369270 is 7296393912.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 808381 + ... + 835079.

It is an arithmetic number, because the mean of its divisors is an integer number (351558900).

Almost surely, 2^21939369270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21939369270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33749654400).

21939369270 is an abundant number, since it is smaller than the sum of its proper divisors (45559939530).

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

21939369270 is a wasteful number, since it uses less digits than its factorization.

21939369270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26779 (or 26772 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 51.

The spelling of 21939369270 in words is "twenty-one billion, nine hundred thirty-nine million, three hundred sixty-nine thousand, two hundred seventy".