121026840 has 128 divisors (see below), whose sum is σ = 398718720. Its totient is φ = 29145600.

The previous prime is 121026823. The next prime is 121026923. The reversal of 121026840 is 48620121.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 121026840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 365475 + ... + 365805.

It is an arithmetic number, because the mean of its divisors is an integer number (3114990).

Almost surely, 2^121026840 is an apocalyptic number.

121026840 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 121026840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199359360).

121026840 is an abundant number, since it is smaller than the sum of its proper divisors (277691880).

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

121026840 is a wasteful number, since it uses less digits than its factorization.

121026840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 121026840 is about 11001.2199323530. The cubic root of 121026840 is about 494.6453126920.

Adding to 121026840 its reverse (48620121), we get a palindrome (169646961).

The spelling of 121026840 in words is "one hundred twenty-one million, twenty-six thousand, eight hundred forty".