21121002210 has 64 divisors (see below), whose sum is σ = 63198434304. Its totient is φ = 4388779200.

The previous prime is 21121002187. The next prime is 21121002211. The reversal of 21121002210 is 1220012112.

It is not an unprimeable number, because it can be changed into a prime (21121002211) 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 31 ways as a sum of consecutive naturals, for example, 4569336 + ... + 4573955.

It is an arithmetic number, because the mean of its divisors is an integer number (987475536).

Almost surely, 2^21121002210 is an apocalyptic number.

21121002210 is an abundant number, since it is smaller than the sum of its proper divisors (42077432094).

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

21121002210 is a wasteful number, since it uses less digits than its factorization.

21121002210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9143319.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21121002210 its reverse (1220012112), we get a palindrome (22341014322).

The spelling of 21121002210 in words is "twenty-one billion, one hundred twenty-one million, two thousand, two hundred ten".