20197121 has 8 divisors (see below), whose sum is σ = 23112960. Its totient is φ = 17288928.

The previous prime is 20197109. The next prime is 20197123. The reversal of 20197121 is 12179102.

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

It is a cyclic number.

It is not a de Polignac number, because 20197121 - 2¹⁴ = 20180737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20197123) 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, 5885 + ... + 8661.

It is an arithmetic number, because the mean of its divisors is an integer number (2889120).

Almost surely, 2^20197121 is an apocalyptic number.

It is an amenable number.

20197121 is a deficient number, since it is larger than the sum of its proper divisors (2915839).

20197121 is a wasteful number, since it uses less digits than its factorization.

20197121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3823.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 20197121 is about 4494.1207148896. The cubic root of 20197121 is about 272.3306289756.

The spelling of 20197121 in words is "twenty million, one hundred ninety-seven thousand, one hundred twenty-one".