21202000002 has 24 divisors (see below), whose sum is σ = 46230269436. Its totient is φ = 7022317536.

The previous prime is 21201999977. The next prime is 21202000009. The reversal of 21202000002 is 20000020212.

It can be written as a sum of positive squares in 2 ways, for example, as 20090511081 + 1111488921 = 141741^2 + 33339^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

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

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3748413 + ... + 3754064.

Almost surely, 2^21202000002 is an apocalyptic number.

21202000002 is an abundant number, since it is smaller than the sum of its proper divisors (25028269434).

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

21202000002 is a wasteful number, since it uses less digits than its factorization.

21202000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7502642 (or 7502639 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 21202000002 its reverse (20000020212), we get a palindrome (41202020214).

The spelling of 21202000002 in words is "twenty-one billion, two hundred two million, two", and thus it is an aban number.