121231345400 has 192 divisors, whose sum is σ = 310615119360. Its totient is φ = 43638080000.

The previous prime is 121231345373. The next prime is 121231345423. The reversal of 121231345400 is 4543132121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121231345400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 114260870 + ... + 114261930.

It is an arithmetic number, because the mean of its divisors is an integer number (1617787080).

Almost surely, 2^121231345400 is an apocalyptic number.

121231345400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121231345400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155307559680).

121231345400 is an abundant number, since it is smaller than the sum of its proper divisors (189383773960).

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

121231345400 is a wasteful number, since it uses less digits than its factorization.

121231345400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566 (or 1557 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 121231345400 its reverse (4543132121), we get a palindrome (125774477521).

The spelling of 121231345400 in words is "one hundred twenty-one billion, two hundred thirty-one million, three hundred forty-five thousand, four hundred".