1001212112220 has 48 divisors (see below), whose sum is σ = 2803473808800. Its totient is φ = 266982287616.

The previous prime is 1001212112183. The next prime is 1001212112231. The reversal of 1001212112220 is 222112121001.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1001212112220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2070234 + ... + 2507646.

It is an arithmetic number, because the mean of its divisors is an integer number (58405704350).

Almost surely, 2^{1001212112220} is an apocalyptic number.

1001212112220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001212112220 is an abundant number, since it is smaller than the sum of its proper divisors (1802261696580).

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

1001212112220 is a wasteful number, since it uses less digits than its factorization.

1001212112220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475574 (or 475572 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1001212112220 its reverse (222112121001), we get a palindrome (1223324233221).

The spelling of 1001212112220 in words is "one trillion, one billion, two hundred twelve million, one hundred twelve thousand, two hundred twenty".