21202020210 has 64 divisors (see below), whose sum is σ = 59340960000. Its totient is φ = 4846173696.

The previous prime is 21202020199. The next prime is 21202020233. The reversal of 21202020210 is 1202020212.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1019935 + ... + 1040514.

It is an arithmetic number, because the mean of its divisors is an integer number (927202500).

Almost surely, 2^21202020210 is an apocalyptic number.

21202020210 is an abundant number, since it is smaller than the sum of its proper divisors (38138939790).

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

21202020210 is a wasteful number, since it uses less digits than its factorization.

21202020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2060480 (or 2060466 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21202020210 its reverse (1202020212), we get a palindrome (22404040422).

It can be divided in two parts, 212020202 and 10, that added together give a palindrome (212020212).

The spelling of 21202020210 in words is "twenty-one billion, two hundred two million, twenty thousand, two hundred ten".