1221210000212 has 6 divisors (see below), whose sum is σ = 2137117500378. Its totient is φ = 610605000104.

The previous prime is 1221210000187. The next prime is 1221210000281. The reversal of 1221210000212 is 2120000121221.

It can be written as a sum of positive squares in only one way, i.e., 655170449476 + 566039550736 = 809426^2 + 752356^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152651250023 + ... + 152651250030.

It is an arithmetic number, because the mean of its divisors is an integer number (356186250063).

Almost surely, 2^{1221210000212} is an apocalyptic number.

It is an amenable number.

1221210000212 is a deficient number, since it is larger than the sum of its proper divisors (915907500166).

1221210000212 is a wasteful number, since it uses less digits than its factorization.

1221210000212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305302500057 (or 305302500055 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221210000212 its reverse (2120000121221), we get a palindrome (3341210121433).

The spelling of 1221210000212 in words is "one trillion, two hundred twenty-one billion, two hundred ten million, two hundred twelve", and thus it is an aban number.