201531403043421 has 16 divisors (see below), whose sum is σ = 293137341327360. Its totient is φ = 122139929651120.

The previous prime is 201531403043393. The next prime is 201531403043441. The reversal of 201531403043421 is 124340304135102.

It is a cyclic number.

It is not a de Polignac number, because 201531403043421 - 2¹⁹ = 201531402519133 is a prime.

It is a super-2 number, since 2×201531403043421² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201531403043441) 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, 5477710 + ... + 20810288.

It is an arithmetic number, because the mean of its divisors is an integer number (18321083832960).

Almost surely, 2^{201531403043421} is an apocalyptic number.

It is an amenable number.

201531403043421 is a deficient number, since it is larger than the sum of its proper divisors (91605938283939).

201531403043421 is a wasteful number, since it uses less digits than its factorization.

201531403043421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15730896.

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 201531403043421 its reverse (124340304135102), we get a palindrome (325871707178523).

The spelling of 201531403043421 in words is "two hundred one trillion, five hundred thirty-one billion, four hundred three million, forty-three thousand, four hundred twenty-one".