121201421 has 16 divisors (see below), whose sum is σ = 138862080. Its totient is φ = 104710320.

The previous prime is 121201417. The next prime is 121201433. The reversal of 121201421 is 124102121.

It is a happy number.

It is not a de Polignac number, because 121201421 - 2² = 121201417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121201396 and 121201405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39770 + ... + 42708.

It is an arithmetic number, because the mean of its divisors is an integer number (8678880).

Almost surely, 2^121201421 is an apocalyptic number.

121201421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121201421 is a deficient number, since it is larger than the sum of its proper divisors (17660659).

121201421 is a wasteful number, since it uses less digits than its factorization.

121201421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3136.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 121201421 is about 11009.1516930234. The cubic root of 121201421 is about 494.8830400808.

Adding to 121201421 its reverse (124102121), we get a palindrome (245303542).

The spelling of 121201421 in words is "one hundred twenty-one million, two hundred one thousand, four hundred twenty-one".