121401291 has 32 divisors (see below), whose sum is σ = 187453440. Its totient is φ = 69159200.

The previous prime is 121401229. The next prime is 121401299. The reversal of 121401291 is 192104121.

It is a happy number.

It is not a de Polignac number, because 121401291 - 2⁹ = 121400779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121401299) 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, 43426 + ... + 46136.

It is an arithmetic number, because the mean of its divisors is an integer number (5857920).

Almost surely, 2^121401291 is an apocalyptic number.

121401291 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121401291 is a deficient number, since it is larger than the sum of its proper divisors (66052149).

121401291 is a wasteful number, since it uses less digits than its factorization.

121401291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2807.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 121401291 is about 11018.2254015790. The cubic root of 121401291 is about 495.1549234492.

It can be divided in two parts, 12140 and 1291, that added together give a palindrome (13431).

The spelling of 121401291 in words is "one hundred twenty-one million, four hundred one thousand, two hundred ninety-one".