121321020 has 24 divisors (see below), whose sum is σ = 339699024. Its totient is φ = 32352256.

The previous prime is 121321019. The next prime is 121321043. The reversal of 121321020 is 20123121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 121320987 and 121321005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010949 + ... + 1011068.

It is an arithmetic number, because the mean of its divisors is an integer number (14154126).

Almost surely, 2^121321020 is an apocalyptic number.

121321020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121321020 is an abundant number, since it is smaller than the sum of its proper divisors (218378004).

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

121321020 is a wasteful number, since it uses less digits than its factorization.

121321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022029 (or 2022027 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 121321020 is about 11014.5821527646. The cubic root of 121321020 is about 495.0457666081.

Adding to 121321020 its reverse (20123121), we get a palindrome (141444141).

The spelling of 121321020 in words is "one hundred twenty-one million, three hundred twenty-one thousand, twenty".