121742421 has 8 divisors (see below), whose sum is σ = 162468864. Its totient is φ = 81088800.

The previous prime is 121742419. The next prime is 121742441. The reversal of 121742421 is 124247121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121742421 - 2¹ = 121742419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121742391 and 121742400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121742441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14176 + ... + 21081.

It is an arithmetic number, because the mean of its divisors is an integer number (20308608).

Almost surely, 2^121742421 is an apocalyptic number.

It is an amenable number.

121742421 is a deficient number, since it is larger than the sum of its proper divisors (40726443).

121742421 is a wasteful number, since it uses less digits than its factorization.

121742421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36411.

The product of its digits is 896, while the sum is 24.

The square root of 121742421 is about 11033.6948027395. The cubic root of 121742421 is about 495.6182744654.

Adding to 121742421 its reverse (124247121), we get a palindrome (245989542).

The spelling of 121742421 in words is "one hundred twenty-one million, seven hundred forty-two thousand, four hundred twenty-one".