121100020 has 12 divisors (see below), whose sum is σ = 254310084. Its totient is φ = 48440000.

The previous prime is 121100017. The next prime is 121100029. The reversal of 121100020 is 20001121.

It can be written as a sum of positive squares in 2 ways, for example, as 13853284 + 107246736 = 3722^2 + 10356^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121099976 and 121100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3027481 + ... + 3027520.

It is an arithmetic number, because the mean of its divisors is an integer number (21192507).

Almost surely, 2^121100020 is an apocalyptic number.

121100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121100020 is an abundant number, since it is smaller than the sum of its proper divisors (133210064).

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

121100020 is a wasteful number, since it uses less digits than its factorization.

121100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6055010 (or 6055008 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 121100020 is about 11004.5454245053. The cubic root of 121100020 is about 494.7449898946.

Adding to 121100020 its reverse (20001121), we get a palindrome (141101141).

The spelling of 121100020 in words is "one hundred twenty-one million, one hundred thousand, twenty".