1221010010212 has 24 divisors (see below), whose sum is σ = 2249321387040. Its totient is φ = 578349397440.

The previous prime is 1221010010161. The next prime is 1221010010243. The reversal of 1221010010212 is 2120100101221.

It is a junction number, because it is equal to n+sod(n) for n = 1221010010192 and 1221010010201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1605912 + ... + 2240752.

It is an arithmetic number, because the mean of its divisors is an integer number (93721724460).

Almost surely, 2^{1221010010212} is an apocalyptic number.

It is an amenable number.

1221010010212 is a deficient number, since it is larger than the sum of its proper divisors (1028311376828).

1221010010212 is a wasteful number, since it uses less digits than its factorization.

1221010010212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660171 (or 660169 counting only the distinct ones).

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

Adding to 1221010010212 its reverse (2120100101221), we get a palindrome (3341110111433).

The spelling of 1221010010212 in words is "one trillion, two hundred twenty-one billion, ten million, ten thousand, two hundred twelve".