121663421 has 4 divisors (see below), whose sum is σ = 132723744. Its totient is φ = 110603100.

The previous prime is 121663393. The next prime is 121663427. The reversal of 121663421 is 124366121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121663421 - 2¹⁴ = 121647037 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 (121663427) 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, 5530145 + ... + 5530166.

It is an arithmetic number, because the mean of its divisors is an integer number (33180936).

Almost surely, 2^121663421 is an apocalyptic number.

121663421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121663421 is a deficient number, since it is larger than the sum of its proper divisors (11060323).

121663421 is a wasteful number, since it uses less digits than its factorization.

121663421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11060322.

The product of its digits is 1728, while the sum is 26.

The square root of 121663421 is about 11030.1142786464. The cubic root of 121663421 is about 495.5110472131.

The spelling of 121663421 in words is "one hundred twenty-one million, six hundred sixty-three thousand, four hundred twenty-one".