121201120000021 has 8 divisors (see below), whose sum is σ = 123976031871744. Its totient is φ = 118434381654960.

The previous prime is 121201120000019. The next prime is 121201120000043. The reversal of 121201120000021 is 120000021102121.

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

It is a cyclic number.

It is not a de Polignac number, because 121201120000021 - 2¹ = 121201120000019 is a prime.

It is a super-2 number, since 2×121201120000021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121201119999956 and 121201120000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201120000721) 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, 2043351670 + ... + 2043410983.

It is an arithmetic number, because the mean of its divisors is an integer number (15497003983968).

Almost surely, 2^{121201120000021} is an apocalyptic number.

It is an amenable number.

121201120000021 is a deficient number, since it is larger than the sum of its proper divisors (2774911871723).

121201120000021 is an equidigital number, since it uses as much as digits as its factorization.

121201120000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4086763331.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121201120000021 its reverse (120000021102121), we get a palindrome (241201141102142).

The spelling of 121201120000021 in words is "one hundred twenty-one trillion, two hundred one billion, one hundred twenty million, twenty-one", and thus it is an aban number.