121530400001 has 4 divisors (see below), whose sum is σ = 121545410004. Its totient is φ = 121515390000.

The previous prime is 121530399997. The next prime is 121530400049. The reversal of 121530400001 is 100004035121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100004035121 = 23 ⋅4348001527.

It can be written as a sum of positive squares in 2 ways, for example, as 101092838401 + 20437561600 = 317951^2 + 142960^2 .

It is a cyclic number.

It is not a de Polignac number, because 121530400001 - 2² = 121530399997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121530400301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7492850 + ... + 7509051.

It is an arithmetic number, because the mean of its divisors is an integer number (30386352501).

Almost surely, 2^121530400001 is an apocalyptic number.

It is an amenable number.

121530400001 is a deficient number, since it is larger than the sum of its proper divisors (15010003).

121530400001 is an equidigital number, since it uses as much as digits as its factorization.

121530400001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15010002.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 121530400001 its reverse (100004035121), we get a palindrome (221534435122).

The spelling of 121530400001 in words is "one hundred twenty-one billion, five hundred thirty million, four hundred thousand, one".