1221121201102 has 16 divisors (see below), whose sum is σ = 2000078140032. Its totient is φ = 554532921720.

The previous prime is 1221121201099. The next prime is 1221121201103. The reversal of 1221121201102 is 2011021211221.

It is a super-2 number, since 2×1221121201102² (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 (1221121201103) 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, 26084568 + ... + 26131339.

It is an arithmetic number, because the mean of its divisors is an integer number (125004883752).

Almost surely, 2^{1221121201102} is an apocalyptic number.

1221121201102 is a deficient number, since it is larger than the sum of its proper divisors (778956938930).

1221121201102 is a wasteful number, since it uses less digits than its factorization.

1221121201102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52216983.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221121201102 its reverse (2011021211221), we get a palindrome (3232142412323).

The spelling of 1221121201102 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, two hundred one thousand, one hundred two".