21122220010 has 32 divisors (see below), whose sum is σ = 42375234240. Its totient is φ = 7533372672.

The previous prime is 21122219999. The next prime is 21122220043. The reversal of 21122220010 is 1002222112.

It is a happy number.

It is a super-2 number, since 2×21122220010² (a number of 21 digits) contains 22 as substring.

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, 3266464 + ... + 3272923.

It is an arithmetic number, because the mean of its divisors is an integer number (1324226070).

Almost surely, 2^21122220010 is an apocalyptic number.

21122220010 is an abundant number, since it is smaller than the sum of its proper divisors (21253014230).

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

21122220010 is a wasteful number, since it uses less digits than its factorization.

21122220010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6539430.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21122220010 its reverse (1002222112), we get a palindrome (22124442122).

The spelling of 21122220010 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty thousand, ten".