43130221551 has 40 divisors (see below), whose sum is σ = 66937693680. Its totient is φ = 27642480768.

The previous prime is 43130221499. The next prime is 43130221571. The reversal of 43130221551 is 15512203134.

43130221551 is a `hidden beast` number, since 431 + 3 + 0 + 221 + 5 + 5 + 1 = 666.

It is not a de Polignac number, because 43130221551 - 2⁶ = 43130221487 is a prime.

It is a super-2 number, since 2×43130221551² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43130221571) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 507916 + ... + 586718.

It is an arithmetic number, because the mean of its divisors is an integer number (1673442342).

Almost surely, 2^43130221551 is an apocalyptic number.

43130221551 is a deficient number, since it is larger than the sum of its proper divisors (23807472129).

43130221551 is a wasteful number, since it uses less digits than its factorization.

43130221551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79077 (or 79068 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 43130221551 its reverse (15512203134), we get a palindrome (58642424685).

The spelling of 43130221551 in words is "forty-three billion, one hundred thirty million, two hundred twenty-one thousand, five hundred fifty-one".