21022121210 has 32 divisors (see below), whose sum is σ = 39506918400. Its totient is φ = 8038787328.

The previous prime is 21022121207. The next prime is 21022121251. The reversal of 21022121210 is 1212122012.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406391 + ... + 455189.

It is an arithmetic number, because the mean of its divisors is an integer number (1234591200).

Almost surely, 2^21022121210 is an apocalyptic number.

21022121210 is a deficient number, since it is larger than the sum of its proper divisors (18484797190).

21022121210 is a wasteful number, since it uses less digits than its factorization.

21022121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50702.

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

Adding to 21022121210 its reverse (1212122012), we get a palindrome (22234243222).

The spelling of 21022121210 in words is "twenty-one billion, twenty-two million, one hundred twenty-one thousand, two hundred ten".