121021121102021 has 16 divisors (see below), whose sum is σ = 138704973619200. Its totient is φ = 103436381241648.

The previous prime is 121021121101987. The next prime is 121021121102027. The reversal of 121021121102021 is 120201121120121.

It is not a de Polignac number, because 121021121102021 - 2¹⁴ = 121021121085637 is a prime.

It is a super-2 number, since 2×121021121102021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021121102027) 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, 9481151 + ... + 18219068.

It is an arithmetic number, because the mean of its divisors is an integer number (8669060851200).

Almost surely, 2^{121021121102021} is an apocalyptic number.

It is an amenable number.

121021121102021 is a deficient number, since it is larger than the sum of its proper divisors (17683852517179).

121021121102021 is a wasteful number, since it uses less digits than its factorization.

121021121102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27702008.

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

Adding to 121021121102021 its reverse (120201121120121), we get a palindrome (241222242222142).

The spelling of 121021121102021 in words is "one hundred twenty-one trillion, twenty-one billion, one hundred twenty-one million, one hundred two thousand, twenty-one".