201026421 has 16 divisors (see below), whose sum is σ = 298845120. Its totient is φ = 133554960.

The previous prime is 201026401. The next prime is 201026431. The reversal of 201026421 is 124620102.

201026421 is a `hidden beast` number, since 20 + 1 + 0 + 2 + 642 + 1 = 666.

It is not a de Polignac number, because 201026421 - 2¹⁴ = 201010037 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201026394 and 201026403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201026401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4795 + ... + 20616.

It is an arithmetic number, because the mean of its divisors is an integer number (18677820).

Almost surely, 2^201026421 is an apocalyptic number.

It is an amenable number.

201026421 is a deficient number, since it is larger than the sum of its proper divisors (97818699).

201026421 is a wasteful number, since it uses less digits than its factorization.

201026421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25713 (or 25707 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 201026421 is about 14178.3786449650. The cubic root of 201026421 is about 585.8022654814.

Adding to 201026421 its reverse (124620102), we get a palindrome (325646523).

The spelling of 201026421 in words is "two hundred one million, twenty-six thousand, four hundred twenty-one".