201423021553 has 4 divisors (see below), whose sum is σ = 216917100148. Its totient is φ = 185928942960.

The previous prime is 201423021533. The next prime is 201423021581. The reversal of 201423021553 is 355120324102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51830441569 + 149592579984 = 227663^2 + 386772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201423021553 is a prime.

It is a super-2 number, since 2×201423021553² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201423021533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7747039278 + ... + 7747039303.

It is an arithmetic number, because the mean of its divisors is an integer number (54229275037).

Almost surely, 2^201423021553 is an apocalyptic number.

It is an amenable number.

201423021553 is a deficient number, since it is larger than the sum of its proper divisors (15494078595).

201423021553 is a wasteful number, since it uses less digits than its factorization.

201423021553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15494078594.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 201423021553 its reverse (355120324102), we get a palindrome (556543345655).

The spelling of 201423021553 in words is "two hundred one billion, four hundred twenty-three million, twenty-one thousand, five hundred fifty-three".