1221021101012 has 48 divisors (see below), whose sum is σ = 2213335337472. Its totient is φ = 588778813440.

The previous prime is 1221021100963. The next prime is 1221021101023. The reversal of 1221021101012 is 2101011201221.

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, 48686108 + ... + 48711180.

It is an arithmetic number, because the mean of its divisors is an integer number (46111152864).

Almost surely, 2^{1221021101012} is an apocalyptic number.

It is an amenable number.

1221021101012 is a deficient number, since it is larger than the sum of its proper divisors (992314236460).

1221021101012 is a wasteful number, since it uses less digits than its factorization.

1221021101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26448 (or 26446 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221021101012 its reverse (2101011201221), we get a palindrome (3322032302233).

The spelling of 1221021101012 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred one thousand, twelve".