121121020 has 24 divisors (see below), whose sum is σ = 255284064. Its totient is φ = 48271296.

The previous prime is 121121003. The next prime is 121121083. The reversal of 121121020 is 20121121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 121120988 and 121121006.

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, 5392 + ... + 16471.

It is an arithmetic number, because the mean of its divisors is an integer number (10636836).

Almost surely, 2^121121020 is an apocalyptic number.

121121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121121020 is an abundant number, since it is smaller than the sum of its proper divisors (134163044).

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

121121020 is a wasteful number, since it uses less digits than its factorization.

121121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22149 (or 22147 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 121121020 is about 11005.4995343237. The cubic root of 121121020 is about 494.7735862133.

Adding to 121121020 its reverse (20121121), we get a palindrome (141242141).

The spelling of 121121020 in words is "one hundred twenty-one million, one hundred twenty-one thousand, twenty".