21020002210 has 8 divisors (see below), whose sum is σ = 37836003996. Its totient is φ = 8408000880.

The previous prime is 21020002207. The next prime is 21020002231. The reversal of 21020002210 is 1220002012.

It can be written as a sum of positive squares in 2 ways, for example, as 19049796441 + 1970205769 = 138021^2 + 44387^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 2102000221 = 21020002210 / (2 + 1 + 0 + 2 + 0 + 0 + 0 + 2 + 2 + 1 + 0).

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, 1051000101 + ... + 1051000120.

Almost surely, 2^21020002210 is an apocalyptic number.

21020002210 is a deficient number, since it is larger than the sum of its proper divisors (16816001786).

21020002210 is a wasteful number, since it uses less digits than its factorization.

21020002210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102000228.

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

Adding to 21020002210 its reverse (1220002012), we get a palindrome (22240004222).

The spelling of 21020002210 in words is "twenty-one billion, twenty million, two thousand, two hundred ten".