1221011000212 has 6 divisors (see below), whose sum is σ = 2136769250378. Its totient is φ = 610505500104.

The previous prime is 1221011000191. The next prime is 1221011000219. The reversal of 1221011000212 is 2120001101221.

It can be written as a sum of positive squares in only one way, i.e., 933163728016 + 287847272196 = 966004^2 + 536514^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221011000192 and 1221011000201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221011000219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152626375023 + ... + 152626375030.

Almost surely, 2^{1221011000212} is an apocalyptic number.

It is an amenable number.

1221011000212 is a deficient number, since it is larger than the sum of its proper divisors (915758250166).

1221011000212 is a wasteful number, since it uses less digits than its factorization.

1221011000212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305252750057 (or 305252750055 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221011000212 its reverse (2120001101221), we get a palindrome (3341012101433).

The spelling of 1221011000212 in words is "one trillion, two hundred twenty-one billion, eleven million, two hundred twelve", and thus it is an aban number.