121401243 has 12 divisors (see below), whose sum is σ = 175631248. Its totient is φ = 80807760.

The previous prime is 121401229. The next prime is 121401299. The reversal of 121401243 is 342104121.

121401243 is a `hidden beast` number, since 1 + 21 + 401 + 243 = 666.

It is not a de Polignac number, because 121401243 - 2⁹ = 121400731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122401243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4255 + ... + 16152.

Almost surely, 2^121401243 is an apocalyptic number.

121401243 is a deficient number, since it is larger than the sum of its proper divisors (54230005).

121401243 is a wasteful number, since it uses less digits than its factorization.

121401243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21074 (or 21071 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 121401243 is about 11018.2232233695. The cubic root of 121401243 is about 495.1548581905.

Adding to 121401243 its reverse (342104121), we get a palindrome (463505364).

The spelling of 121401243 in words is "one hundred twenty-one million, four hundred one thousand, two hundred forty-three".