211212222211220 has 96 divisors (see below), whose sum is σ = 463084410700800. Its totient is φ = 80767270932480.

The previous prime is 211212222211219. The next prime is 211212222211223. The reversal of 211212222211220 is 22112222212112.

It is a super-2 number, since 2×211212222211220² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211212222211223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6936574556 + ... + 6936605004.

It is an arithmetic number, because the mean of its divisors is an integer number (4823795944800).

Almost surely, 2^{211212222211220} is an apocalyptic number.

211212222211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211212222211220 is an abundant number, since it is smaller than the sum of its proper divisors (251872188489580).

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

211212222211220 is a wasteful number, since it uses less digits than its factorization.

211212222211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38265 (or 38263 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 211212222211220 its reverse (22112222212112), we get a palindrome (233324444423332).

The spelling of 211212222211220 in words is "two hundred eleven trillion, two hundred twelve billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twenty".