201421123 has 2 divisors, whose sum is σ = 201421124. Its totient is φ = 201421122.

The previous prime is 201421093. The next prime is 201421127. The reversal of 201421123 is 321124102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201421123 is a prime.

It is a super-2 number, since 2×201421123² = 81140937581162258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201421097 and 201421106.

It is not a weakly prime, because it can be changed into another prime (201421127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100710561 + 100710562.

It is an arithmetic number, because the mean of its divisors is an integer number (100710562).

Almost surely, 2^201421123 is an apocalyptic number.

201421123 is a deficient number, since it is larger than the sum of its proper divisors (1).

201421123 is an equidigital number, since it uses as much as digits as its factorization.

201421123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 201421123 is about 14192.2909708052. The cubic root of 201421123 is about 586.1854094199.

Adding to 201421123 its reverse (321124102), we get a palindrome (522545225).

The spelling of 201421123 in words is "two hundred one million, four hundred twenty-one thousand, one hundred twenty-three".