121156421 has 8 divisors (see below), whose sum is σ = 123971904. Its totient is φ = 118372320.

The previous prime is 121156393. The next prime is 121156487. The reversal of 121156421 is 124651121.

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

It is a cyclic number.

It is not a de Polignac number, because 121156421 - 2¹⁴ = 121140037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121156121) 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, 56 + ... + 15566.

It is an arithmetic number, because the mean of its divisors is an integer number (15496488).

Almost surely, 2^121156421 is an apocalyptic number.

It is an amenable number.

121156421 is a deficient number, since it is larger than the sum of its proper divisors (2815483).

121156421 is a wasteful number, since it uses less digits than its factorization.

121156421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15691.

The product of its digits is 480, while the sum is 23.

The square root of 121156421 is about 11007.1077490865. The cubic root of 121156421 is about 494.8217853163.

The spelling of 121156421 in words is "one hundred twenty-one million, one hundred fifty-six thousand, four hundred twenty-one".