21010222111212 has 72 divisors (see below), whose sum is σ = 57832129882800. Its totient is φ = 6406020528768.

The previous prime is 21010222111211. The next prime is 21010222111213. The reversal of 21010222111212 is 21211122201012.

21010222111212 is a `hidden beast` number, since 210 + 10 + 2 + 221 + 11 + 212 = 666.

It is an interprime number because it is at equal distance from previous prime (21010222111211) and next prime (21010222111213).

It is a super-2 number, since 2×21010222111212² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21010222111211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 529578423 + ... + 529618094.

It is an arithmetic number, because the mean of its divisors is an integer number (803224026150).

Almost surely, 2^{21010222111212} is an apocalyptic number.

It is an amenable number.

21010222111212 is an abundant number, since it is smaller than the sum of its proper divisors (36821907771588).

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

21010222111212 is a wasteful number, since it uses less digits than its factorization.

21010222111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059196575 (or 1059196570 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21010222111212 its reverse (21211122201012), we get a palindrome (42221344312224).

The spelling of 21010222111212 in words is "twenty-one trillion, ten billion, two hundred twenty-two million, one hundred eleven thousand, two hundred twelve".