21202102000 has 40 divisors (see below), whose sum is σ = 51266687472. Its totient is φ = 8480840000.

The previous prime is 21202101997. The next prime is 21202102001. The reversal of 21202102000 is 20120212.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202102001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5298526 + ... + 5302525.

Almost surely, 2^21202102000 is an apocalyptic number.

21202102000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202102000 is an abundant number, since it is smaller than the sum of its proper divisors (30064585472).

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

21202102000 is a wasteful number, since it uses less digits than its factorization.

21202102000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10601074 (or 10601058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21202102000 its reverse (20120212), we get a palindrome (21222222212).

The spelling of 21202102000 in words is "twenty-one billion, two hundred two million, one hundred two thousand".