1221110100102 has 16 divisors (see below), whose sum is σ = 2442263806512. Its totient is φ = 407029432320.

The previous prime is 1221110100101. The next prime is 1221110100131. The reversal of 1221110100102 is 2010010111221.

It is a super-2 number, since 2×1221110100102² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221110100101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1447099 + ... + 2129862.

It is an arithmetic number, because the mean of its divisors is an integer number (152641487907).

Almost surely, 2^{1221110100102} is an apocalyptic number.

1221110100102 is an abundant number, since it is smaller than the sum of its proper divisors (1221153706410).

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

1221110100102 is a wasteful number, since it uses less digits than its factorization.

1221110100102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3633863.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1221110100102 its reverse (2010010111221), we get a palindrome (3231120211323).

The spelling of 1221110100102 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, one hundred thousand, one hundred two".