121631430 has 48 divisors (see below), whose sum is σ = 310119120. Its totient is φ = 30524928.

The previous prime is 121631399. The next prime is 121631431. The reversal of 121631430 is 34136121.

It is a junction number, because it is equal to n+sod(n) for n = 121631397 and 121631406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121631431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1656 + ... + 15684.

It is an arithmetic number, because the mean of its divisors is an integer number (6460815).

Almost surely, 2^121631430 is an apocalyptic number.

121631430 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 121631430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155059560).

121631430 is an abundant number, since it is smaller than the sum of its proper divisors (188487690).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121631430 is a wasteful number, since it uses less digits than its factorization.

121631430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14073 (or 14056 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 121631430 is about 11028.6640170059. The cubic root of 121631430 is about 495.4676124010.

Adding to 121631430 its reverse (34136121), we get a palindrome (155767551).

The spelling of 121631430 in words is "one hundred twenty-one million, six hundred thirty-one thousand, four hundred thirty".