121021020 has 48 divisors (see below), whose sum is σ = 376511520. Its totient is φ = 32272128.

The previous prime is 121021007. The next prime is 121021037. The reversal of 121021020 is 20120121.

It is a super-4 number, since 4×121021020⁴ (a number of 33 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 121020993 and 121021011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111517 + ... + 112596.

It is an arithmetic number, because the mean of its divisors is an integer number (7843990).

Almost surely, 2^121021020 is an apocalyptic number.

121021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021020 is an abundant number, since it is smaller than the sum of its proper divisors (255490500).

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

121021020 is a wasteful number, since it uses less digits than its factorization.

121021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224131 (or 224123 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 121021020 is about 11000.9554130539. The cubic root of 121021020 is about 494.6373836467.

Adding to 121021020 its reverse (20120121), we get a palindrome (141141141).

The spelling of 121021020 in words is "one hundred twenty-one million, twenty-one thousand, twenty".