121021143 has 16 divisors (see below), whose sum is σ = 163029120. Its totient is φ = 79851744.

The previous prime is 121021111. The next prime is 121021151. The reversal of 121021143 is 341120121.

It is not a de Polignac number, because 121021143 - 2⁵ = 121021111 is a prime.

It is a super-2 number, since 2×121021143² = 29292234106052898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185005 + ... + 185657.

It is an arithmetic number, because the mean of its divisors is an integer number (10189320).

Almost surely, 2^121021143 is an apocalyptic number.

121021143 is a deficient number, since it is larger than the sum of its proper divisors (42007977).

121021143 is a wasteful number, since it uses less digits than its factorization.

121021143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1198.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 121021143 is about 11000.9610034760. The cubic root of 121021143 is about 494.6375512220.

Adding to 121021143 its reverse (341120121), we get a palindrome (462141264).

The spelling of 121021143 in words is "one hundred twenty-one million, twenty-one thousand, one hundred forty-three".