121021000 has 32 divisors (see below), whose sum is σ = 283191480. Its totient is φ = 48408000.

The previous prime is 121020997. The next prime is 121021003. The reversal of 121021000 is 120121.

It is an interprime number because it is at equal distance from previous prime (121020997) and next prime (121021003).

It can be written as a sum of positive squares in 4 ways, for example, as 7001316 + 114019684 = 2646^2 + 10678^2 .

It is not an unprimeable number, because it can be changed into a prime (121021003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59511 + ... + 61510.

Almost surely, 2^121021000 is an apocalyptic number.

121021000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021000 is an abundant number, since it is smaller than the sum of its proper divisors (162170480).

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

121021000 is a wasteful number, since it uses less digits than its factorization.

121021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121042 (or 121028 counting only the distinct ones).

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

The square root of 121021000 is about 11000.9545040419. The cubic root of 121021000 is about 494.6373563987.

Adding to 121021000 its reverse (120121), we get a palindrome (121141121).

The spelling of 121021000 in words is "one hundred twenty-one million, twenty-one thousand".