20212129 has 8 divisors (see below), whose sum is σ = 23266880. Its totient is φ = 17199216.

The previous prime is 20212117. The next prime is 20212151. The reversal of 20212129 is 92121202.

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 20212129 - 2⁵ = 20212097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20212529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9414 + ... + 11359.

It is an arithmetic number, because the mean of its divisors is an integer number (2908360).

Almost surely, 2^20212129 is an apocalyptic number.

It is an amenable number.

20212129 is a deficient number, since it is larger than the sum of its proper divisors (3054751).

20212129 is a wasteful number, since it uses less digits than its factorization.

20212129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20919.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 20212129 is about 4495.7901418994. The cubic root of 20212129 is about 272.3980664113.

The spelling of 20212129 in words is "twenty million, two hundred twelve thousand, one hundred twenty-nine".