21203242210 has 8 divisors (see below), whose sum is σ = 38165835996. Its totient is φ = 8481296880.

The previous prime is 21203242199. The next prime is 21203242243. The reversal of 21203242210 is 1224230212.

It can be written as a sum of positive squares in 2 ways, for example, as 19677636729 + 1525605481 = 140277^2 + 39059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060162101 + ... + 1060162120.

Almost surely, 2^21203242210 is an apocalyptic number.

21203242210 is a deficient number, since it is larger than the sum of its proper divisors (16962593786).

21203242210 is a wasteful number, since it uses less digits than its factorization.

21203242210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120324228.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21203242210 its reverse (1224230212), we get a palindrome (22427472422).

The spelling of 21203242210 in words is "twenty-one billion, two hundred three million, two hundred forty-two thousand, two hundred ten".