21202000000 has 112 divisors (see below), whose sum is σ = 52802253810. Its totient is φ = 8480000000.

The previous prime is 21201999977. The next prime is 21202000009. The reversal of 21202000000 is 20212.

It is a happy number.

It can be written as a sum of positive squares in 7 ways, for example, as 7181545536 + 14020454464 = 84744^2 + 118408^2 .

It is not an unprimeable number, because it can be changed into a prime (21202000009) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1994700 + ... + 2005300.

Almost surely, 2^21202000000 is an apocalyptic number.

21202000000 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 21202000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26401126905).

21202000000 is an abundant number, since it is smaller than the sum of its proper divisors (31600253810).

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

21202000000 is an frugal number, since it uses more digits than its factorization.

21202000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10645 (or 10608 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

Adding to 21202000000 its reverse (20212), we get a palindrome (21202020212).

The spelling of 21202000000 in words is "twenty-one billion, two hundred two million", and thus it is an aban number.