1221002102011 has 16 divisors (see below), whose sum is σ = 1303946357760. Its totient is φ = 1140786128160.

The previous prime is 1221002101997. The next prime is 1221002102029. The reversal of 1221002102011 is 1102012001221.

It is a cyclic number.

It is not a de Polignac number, because 1221002102011 - 2³⁹ = 671246288123 is a prime.

It is a super-2 number, since 2×1221002102011² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221002101982 and 1221002102000.

It is not an unprimeable number, because it can be changed into a prime (1221002102041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14668836 + ... + 14751838.

It is an arithmetic number, because the mean of its divisors is an integer number (81496647360).

Almost surely, 2^{1221002102011} is an apocalyptic number.

1221002102011 is a deficient number, since it is larger than the sum of its proper divisors (82944255749).

1221002102011 is a wasteful number, since it uses less digits than its factorization.

1221002102011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99426.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221002102011 its reverse (1102012001221), we get a palindrome (2323014103232).

The spelling of 1221002102011 in words is "one trillion, two hundred twenty-one billion, two million, one hundred two thousand, eleven".