1021221101012 has 24 divisors (see below), whose sum is σ = 2092257867840. Its totient is φ = 426991400640.

The previous prime is 1021221101003. The next prime is 1021221101203. The reversal of 1021221101012 is 2101011221201.

It is a Harshad number since it is a multiple of its sum of digits (14).

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, 444781562 + ... + 444783857.

It is an arithmetic number, because the mean of its divisors is an integer number (87177411160).

Almost surely, 2^{1021221101012} is an apocalyptic number.

It is an amenable number.

1021221101012 is an abundant number, since it is smaller than the sum of its proper divisors (1071036766828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021221101012 is a wasteful number, since it uses less digits than its factorization.

1021221101012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889565471 (or 889565469 counting only the distinct ones).

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

Adding to 1021221101012 its reverse (2101011221201), we get a palindrome (3122232322213).

The spelling of 1021221101012 in words is "one trillion, twenty-one billion, two hundred twenty-one million, one hundred one thousand, twelve".