201826421 has 2 divisors, whose sum is σ = 201826422. Its totient is φ = 201826420.

The previous prime is 201826409. The next prime is 201826423. The reversal of 201826421 is 124628102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194909521 + 6916900 = 13961^2 + 2630^2 .

It is a cyclic number.

It is not a de Polignac number, because 201826421 - 2¹⁰ = 201825397 is a prime.

Together with 201826423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201826423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100913210 + 100913211.

It is an arithmetic number, because the mean of its divisors is an integer number (100913211).

Almost surely, 2^201826421 is an apocalyptic number.

It is an amenable number.

201826421 is a deficient number, since it is larger than the sum of its proper divisors (1).

201826421 is an equidigital number, since it uses as much as digits as its factorization.

201826421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 201826421 is about 14206.5626032478. The cubic root of 201826421 is about 586.5783185587.

The spelling of 201826421 in words is "two hundred one million, eight hundred twenty-six thousand, four hundred twenty-one".