1221100020212 has 24 divisors (see below), whose sum is σ = 2178545193216. Its totient is φ = 598740265728.

The previous prime is 1221100020209. The next prime is 1221100020233. The reversal of 1221100020212 is 2120200011221.

It is a super-3 number, since 3×1221100020212³ (a number of 37 digits) contains 333 as substring.

It is a congruent number.

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, 10156253 + ... + 10275780.

It is an arithmetic number, because the mean of its divisors is an integer number (90772716384).

Almost surely, 2^{1221100020212} is an apocalyptic number.

It is an amenable number.

1221100020212 is a deficient number, since it is larger than the sum of its proper divisors (957445173004).

1221100020212 is a wasteful number, since it uses less digits than its factorization.

1221100020212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20432327 (or 20432325 counting only the distinct ones).

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

Adding to 1221100020212 its reverse (2120200011221), we get a palindrome (3341300031433).

The spelling of 1221100020212 in words is "one trillion, two hundred twenty-one billion, one hundred million, twenty thousand, two hundred twelve".