121221021202102 has 32 divisors (see below), whose sum is σ = 197249904583200. Its totient is φ = 55646332139520.

The previous prime is 121221021202093. The next prime is 121221021202109. The reversal of 121221021202102 is 201202120122121.

It is a super-2 number, since 2×121221021202102² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121221021202102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221021202109) 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, 4477149 + ... + 16201447.

It is an arithmetic number, because the mean of its divisors is an integer number (6164059518225).

Almost surely, 2^{121221021202102} is an apocalyptic number.

121221021202102 is a deficient number, since it is larger than the sum of its proper divisors (76028883381098).

121221021202102 is a wasteful number, since it uses less digits than its factorization.

121221021202102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11731776.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121221021202102 its reverse (201202120122121), we get a palindrome (322423141324223).

The spelling of 121221021202102 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred two thousand, one hundred two".