211212111210220 has 24 divisors (see below), whose sum is σ = 444662676463824. Its totient is φ = 84272036308416.

The previous prime is 211212111210211. The next prime is 211212111210223. The reversal of 211212111210220 is 22012111212112.

It is a happy number.

It is a super-2 number, since 2×211212111210220² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211212111210223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13300502842 + ... + 13300518721.

It is an arithmetic number, because the mean of its divisors is an integer number (18527611519326).

Almost surely, 2^{211212111210220} is an apocalyptic number.

211212111210220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211212111210220 is an abundant number, since it is smaller than the sum of its proper divisors (233450565253604).

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

211212111210220 is a wasteful number, since it uses less digits than its factorization.

211212111210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26601021969 (or 26601021967 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211212111210220 its reverse (22012111212112), we get a palindrome (233224222422332).

The spelling of 211212111210220 in words is "two hundred eleven trillion, two hundred twelve billion, one hundred eleven million, two hundred ten thousand, two hundred twenty".