121200010101021 has 16 divisors (see below), whose sum is σ = 161698749557888. Its totient is φ = 80750644416000.

The previous prime is 121200010100987. The next prime is 121200010101043. The reversal of 121200010101021 is 120101010002121.

It is not a de Polignac number, because 121200010101021 - 2²¹ = 121200008003869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121200010100988 and 121200010101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200010101221) 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, 84989145 + ... + 86403441.

It is an arithmetic number, because the mean of its divisors is an integer number (10106171847368).

Almost surely, 2^{121200010101021} is an apocalyptic number.

It is an amenable number.

121200010101021 is a deficient number, since it is larger than the sum of its proper divisors (40498739456867).

121200010101021 is a wasteful number, since it uses less digits than its factorization.

121200010101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431732.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121200010101021 its reverse (120101010002121), we get a palindrome (241301020103142).

The spelling of 121200010101021 in words is "one hundred twenty-one trillion, two hundred billion, ten million, one hundred one thousand, twenty-one".