201425621 has 2 divisors, whose sum is σ = 201425622. Its totient is φ = 201425620.

The previous prime is 201425573. The next prime is 201425633. The reversal of 201425621 is 126524102.

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., 198415396 + 3010225 = 14086^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 201425621 - 2¹⁴ = 201409237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201421621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100712810 + 100712811.

It is an arithmetic number, because the mean of its divisors is an integer number (100712811).

Almost surely, 2^201425621 is an apocalyptic number.

It is an amenable number.

201425621 is a deficient number, since it is larger than the sum of its proper divisors (1).

201425621 is an equidigital number, since it uses as much as digits as its factorization.

201425621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 201425621 is about 14192.4494362319. The cubic root of 201425621 is about 586.1897728192.

Adding to 201425621 its reverse (126524102), we get a palindrome (327949723).

The spelling of 201425621 in words is "two hundred one million, four hundred twenty-five thousand, six hundred twenty-one".