121355400201 has 32 divisors (see below), whose sum is σ = 196814930688. Its totient is φ = 64928563200.

The previous prime is 121355400113. The next prime is 121355400203. The reversal of 121355400201 is 102004553121.

It is a happy number.

It is not a de Polignac number, because 121355400201 - 2¹⁴ = 121355383817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121355400203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 811750 + ... + 949551.

It is an arithmetic number, because the mean of its divisors is an integer number (6150466584).

Almost surely, 2^121355400201 is an apocalyptic number.

It is an amenable number.

121355400201 is a deficient number, since it is larger than the sum of its proper divisors (75459530487).

121355400201 is a wasteful number, since it uses less digits than its factorization.

121355400201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1761521.

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 121355400201 its reverse (102004553121), we get a palindrome (223359953322).

The spelling of 121355400201 in words is "one hundred twenty-one billion, three hundred fifty-five million, four hundred thousand, two hundred one".