121111012202021 has 8 divisors (see below), whose sum is σ = 121153135009560. Its totient is φ = 121068892182528.

The previous prime is 121111012201937. The next prime is 121111012202119. The reversal of 121111012202021 is 120202210111121.

It can be written as a sum of positive squares in 4 ways, for example, as 573427562500 + 120537584639521 = 757250^2 + 10978961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121111012202021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111012202821) 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, 88162295 + ... + 89525483.

It is an arithmetic number, because the mean of its divisors is an integer number (15144141876195).

Almost surely, 2^{121111012202021} is an apocalyptic number.

It is an amenable number.

121111012202021 is a deficient number, since it is larger than the sum of its proper divisors (42122807539).

121111012202021 is a wasteful number, since it uses less digits than its factorization.

121111012202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394023.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 121111012202021 its reverse (120202210111121), we get a palindrome (241313222313142).

The spelling of 121111012202021 in words is "one hundred twenty-one trillion, one hundred eleven billion, twelve million, two hundred two thousand, twenty-one".