1221011220102 has 16 divisors (see below), whose sum is σ = 2508023047152. Its totient is φ = 396003638880.

The previous prime is 1221011220061. The next prime is 1221011220127. The reversal of 1221011220102 is 2010221101221.

It is a super-2 number, since 2×1221011220102² (a number of 25 digits) contains 22 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, 2750025049 + ... + 2750025492.

It is an arithmetic number, because the mean of its divisors is an integer number (156751440447).

Almost surely, 2^{1221011220102} is an apocalyptic number.

1221011220102 is an abundant number, since it is smaller than the sum of its proper divisors (1287011827050).

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

1221011220102 is a wasteful number, since it uses less digits than its factorization.

1221011220102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5500050583.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221011220102 its reverse (2010221101221), we get a palindrome (3231232321323).

The spelling of 1221011220102 in words is "one trillion, two hundred twenty-one billion, eleven million, two hundred twenty thousand, one hundred two".