201421033553 has 2 divisors, whose sum is σ = 201421033554. Its totient is φ = 201421033552.

The previous prime is 201421033531. The next prime is 201421033571. The reversal of 201421033553 is 355330124102.

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., 181470036049 + 19950997504 = 425993^2 + 141248^2 .

It is a cyclic number.

It is not a de Polignac number, because 201421033553 - 2²⁶ = 201353924689 is a prime.

It is not a weakly prime, because it can be changed into another prime (201421233553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100710516776 + 100710516777.

It is an arithmetic number, because the mean of its divisors is an integer number (100710516777).

Almost surely, 2^201421033553 is an apocalyptic number.

It is an amenable number.

201421033553 is a deficient number, since it is larger than the sum of its proper divisors (1).

201421033553 is an equidigital number, since it uses as much as digits as its factorization.

201421033553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 201421033553 its reverse (355330124102), we get a palindrome (556751157655).

The spelling of 201421033553 in words is "two hundred one billion, four hundred twenty-one million, thirty-three thousand, five hundred fifty-three".