21220111001210 has 32 divisors (see below), whose sum is σ = 42555147178752. Its totient is φ = 7552225190080.

The previous prime is 21220111001191. The next prime is 21220111001267. The reversal of 21220111001210 is 1210011102212.

It is a super-2 number, since 2×21220111001210² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2052229937 + ... + 2052240276.

It is an arithmetic number, because the mean of its divisors is an integer number (1329848349336).

Almost surely, 2^{21220111001210} is an apocalyptic number.

21220111001210 is an abundant number, since it is smaller than the sum of its proper divisors (21335036177542).

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

21220111001210 is a wasteful number, since it uses less digits than its factorization.

21220111001210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4104470278.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21220111001210 its reverse (1210011102212), we get a palindrome (22430122103422).

The spelling of 21220111001210 in words is "twenty-one trillion, two hundred twenty billion, one hundred eleven million, one thousand, two hundred ten".