21012122210 has 16 divisors (see below), whose sum is σ = 38626540416. Its totient is φ = 8226022128.

The previous prime is 21012122191. The next prime is 21012122227. The reversal of 21012122210 is 1222121012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22352852 + ... + 22353791.

It is an arithmetic number, because the mean of its divisors is an integer number (2414158776).

Almost surely, 2^21012122210 is an apocalyptic number.

21012122210 is a deficient number, since it is larger than the sum of its proper divisors (17614418206).

21012122210 is a wasteful number, since it uses less digits than its factorization.

21012122210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44706697.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21012122210 its reverse (1222121012), we get a palindrome (22234243222).

The spelling of 21012122210 in words is "twenty-one billion, twelve million, one hundred twenty-two thousand, two hundred ten".