43212220551 has 8 divisors (see below), whose sum is σ = 64018104560. Its totient is φ = 28808147016.

The previous prime is 43212220517. The next prime is 43212220567. The reversal of 43212220551 is 15502221234.

43212220551 is a `hidden beast` number, since 432 + 1 + 2 + 220 + 5 + 5 + 1 = 666.

It is not a de Polignac number, because 43212220551 - 2¹⁰ = 43212219527 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1600452613 = 43212220551 / (4 + 3 + 2 + 1 + 2 + 2 + 2 + 0 + 5 + 5 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43212220511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 800226280 + ... + 800226333.

It is an arithmetic number, because the mean of its divisors is an integer number (8002263070).

Almost surely, 2^43212220551 is an apocalyptic number.

43212220551 is a deficient number, since it is larger than the sum of its proper divisors (20805884009).

43212220551 is a wasteful number, since it uses less digits than its factorization.

43212220551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600452622 (or 1600452616 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 43212220551 its reverse (15502221234), we get a palindrome (58714441785).

The spelling of 43212220551 in words is "forty-three billion, two hundred twelve million, two hundred twenty thousand, five hundred fifty-one".