1221121000212 has 48 divisors (see below), whose sum is σ = 2928496569600. Its totient is φ = 395740605312.

The previous prime is 1221121000199. The next prime is 1221121000237. The reversal of 1221121000212 is 2120001211221.

It is a super-2 number, since 2×1221121000212² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221121000191 and 1221121000200.

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, 447087 + ... + 1625462.

It is an arithmetic number, because the mean of its divisors is an integer number (61010345200).

Almost surely, 2^{1221121000212} is an apocalyptic number.

1221121000212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221121000212 is an abundant number, since it is smaller than the sum of its proper divisors (1707375569388).

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

1221121000212 is a wasteful number, since it uses less digits than its factorization.

1221121000212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073920 (or 2073918 counting only the distinct ones).

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

Adding to 1221121000212 its reverse (2120001211221), we get a palindrome (3341122211433).

The spelling of 1221121000212 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred twelve", and thus it is an aban number.