1212202120220 has 72 divisors (see below), whose sum is σ = 3189024072864. Its totient is φ = 383641985664.

The previous prime is 1212202120177. The next prime is 1212202120247. The reversal of 1212202120220 is 220212022121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47561912 + ... + 47587391.

It is an arithmetic number, because the mean of its divisors is an integer number (44292001012).

Almost surely, 2^{1212202120220} is an apocalyptic number.

1212202120220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212202120220 is an abundant number, since it is smaller than the sum of its proper divisors (1976821952644).

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

1212202120220 is a wasteful number, since it uses less digits than its factorization.

1212202120220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95149339 (or 95149330 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 1212202120220 its reverse (220212022121), we get a palindrome (1432414142341).

The spelling of 1212202120220 in words is "one trillion, two hundred twelve billion, two hundred two million, one hundred twenty thousand, two hundred twenty".