201121989 has 8 divisors (see below), whose sum is σ = 277409760. Its totient is φ = 129457776.

The previous prime is 201121981. The next prime is 201121993. The reversal of 201121989 is 989121102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 201121989 - 2³ = 201121981 is a prime.

It is a super-2 number, since 2×201121989² = 80900108918632242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121981) 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, 1155787 + ... + 1155960.

It is an arithmetic number, because the mean of its divisors is an integer number (34676220).

Almost surely, 2^201121989 is an apocalyptic number.

201121989 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

201121989 is a deficient number, since it is larger than the sum of its proper divisors (76287771).

201121989 is a wasteful number, since it uses less digits than its factorization.

201121989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2311779.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 201121989 is about 14181.7484465069. The cubic root of 201121989 is about 585.8950809455.

The spelling of 201121989 in words is "two hundred one million, one hundred twenty-one thousand, nine hundred eighty-nine".