1221110100010 has 16 divisors (see below), whose sum is σ = 2219760540072. Its totient is φ = 483607960000.

The previous prime is 1221110099999. The next prime is 1221110100043. The reversal of 1221110100010 is 100010111221.

It can be written as a sum of positive squares in 4 ways, for example, as 1099421452089 + 121688647921 = 1048533^2 + 348839^2 .

It is a super-2 number, since 2×1221110100010² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 1221110100010.

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, 604508941 + ... + 604510960.

Almost surely, 2^{1221110100010} is an apocalyptic number.

1221110100010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221110100010 is a deficient number, since it is larger than the sum of its proper divisors (998650440062).

1221110100010 is a wasteful number, since it uses less digits than its factorization.

1221110100010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209020009.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1221110100010 its reverse (100010111221), we get a palindrome (1321120211231).

The spelling of 1221110100010 in words is "one trillion, two hundred twenty-one billion, one hundred ten million, one hundred thousand, ten".