21032911900 has 324 divisors, whose sum is σ = 62744968440. Its totient is φ = 6048806400.

The previous prime is 21032911883. The next prime is 21032911903. The reversal of 21032911900 is 911923012.

It is a super-2 number, since 2×21032911900² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032911903) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 9107946 + ... + 9110254.

It is an arithmetic number, because the mean of its divisors is an integer number (193657310).

Almost surely, 2^21032911900 is an apocalyptic number.

21032911900 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 21032911900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31372484220).

21032911900 is an abundant number, since it is smaller than the sum of its proper divisors (41712056540).

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

21032911900 is a wasteful number, since it uses less digits than its factorization.

21032911900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2374 (or 2347 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 21032911900 in words is "twenty-one billion, thirty-two million, nine hundred eleven thousand, nine hundred".