121400121421 has 8 divisors (see below), whose sum is σ = 128697886584. Its totient is φ = 114119754240.

The previous prime is 121400121361. The next prime is 121400121433. The reversal of 121400121421 is 124121004121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30769018921 + 90631102500 = 175411^2 + 301050^2 .

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

It is not a de Polignac number, because 121400121421 - 2⁹ = 121400120909 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 (121400122421) 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, 4335120 + ... + 4363033.

It is an arithmetic number, because the mean of its divisors is an integer number (16087235823).

Almost surely, 2^121400121421 is an apocalyptic number.

It is an amenable number.

121400121421 is a deficient number, since it is larger than the sum of its proper divisors (7297765163).

121400121421 is an equidigital number, since it uses as much as digits as its factorization.

121400121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8698991.

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

Adding to 121400121421 its reverse (124121004121), we get a palindrome (245521125542).

The spelling of 121400121421 in words is "one hundred twenty-one billion, four hundred million, one hundred twenty-one thousand, four hundred twenty-one".