21202233312 has 96 divisors (see below), whose sum is σ = 60016021632. Its totient is φ = 6515172864.

The previous prime is 21202233307. The next prime is 21202233329. The reversal of 21202233312 is 21333220212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 971383 + ... + 992969.

It is an arithmetic number, because the mean of its divisors is an integer number (625166892).

Almost surely, 2^21202233312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21202233312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30008010816).

21202233312 is an abundant number, since it is smaller than the sum of its proper divisors (38813788320).

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

21202233312 is a wasteful number, since it uses less digits than its factorization.

21202233312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22400 (or 22392 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21202233312 its reverse (21333220212), we get a palindrome (42535453524).

The spelling of 21202233312 in words is "twenty-one billion, two hundred two million, two hundred thirty-three thousand, three hundred twelve".