21097272000 has 896 divisors, whose sum is σ = 86272542720. Its totient is φ = 4433510400.

The previous prime is 21097271941. The next prime is 21097272011. The reversal of 21097272000 is 27279012.

It is a happy number.

It is a Cunningham number, because it is equal to 145249²-1.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 237047956 + ... + 237048044.

It is an arithmetic number, because the mean of its divisors is an integer number (96286320).

Almost surely, 2^21097272000 is an apocalyptic number.

21097272000 is a gapful number since it is divisible by the number (20) 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 21097272000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43136271360).

21097272000 is an abundant number, since it is smaller than the sum of its proper divisors (65175270720).

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

21097272000 is a wasteful number, since it uses less digits than its factorization.

21097272000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 30.

The spelling of 21097272000 in words is "twenty-one billion, ninety-seven million, two hundred seventy-two thousand".