201421111 has 4 divisors (see below), whose sum is σ = 203007232. Its totient is φ = 199834992.

The previous prime is 201421093. The next prime is 201421123. The reversal of 201421111 is 111124102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201421111 - 2⁵ = 201421079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201421091 and 201421100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201421141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792870 + ... + 793123.

It is an arithmetic number, because the mean of its divisors is an integer number (50751808).

Almost surely, 2^201421111 is an apocalyptic number.

201421111 is a deficient number, since it is larger than the sum of its proper divisors (1586121).

201421111 is a wasteful number, since it uses less digits than its factorization.

201421111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586120.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 201421111 is about 14192.2905480405. The cubic root of 201421111 is about 586.1853977789.

Adding to 201421111 its reverse (111124102), we get a palindrome (312545213).

The spelling of 201421111 in words is "two hundred one million, four hundred twenty-one thousand, one hundred eleven".