121420427 has 4 divisors (see below), whose sum is σ = 126699600. Its totient is φ = 116141256.

The previous prime is 121420391. The next prime is 121420501. The reversal of 121420427 is 724024121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121420427 - 2¹² = 121416331 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 5279149 = 121420427 / (1 + 2 + 1 + 4 + 2 + 0 + 4 + 2 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121428427) 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, 2639552 + ... + 2639597.

It is an arithmetic number, because the mean of its divisors is an integer number (31674900).

Almost surely, 2^121420427 is an apocalyptic number.

121420427 is a deficient number, since it is larger than the sum of its proper divisors (5279173).

121420427 is an equidigital number, since it uses as much as digits as its factorization.

121420427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5279172.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 121420427 is about 11019.0937467652. The cubic root of 121420427 is about 495.1809385125.

Adding to 121420427 its reverse (724024121), we get a palindrome (845444548).

The spelling of 121420427 in words is "one hundred twenty-one million, four hundred twenty thousand, four hundred twenty-seven".