43198759621 has 2 divisors, whose sum is σ = 43198759622. Its totient is φ = 43198759620.

The previous prime is 43198759609. The next prime is 43198759679. The reversal of 43198759621 is 12695789134.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43091947396 + 106812225 = 207586^2 + 10335^2 .

It is a cyclic number.

It is not a de Polignac number, because 43198759621 - 2⁷ = 43198759493 is a prime.

It is a super-2 number, since 2×43198759621² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43198753621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21599379810 + 21599379811.

It is an arithmetic number, because the mean of its divisors is an integer number (21599379811).

Almost surely, 2^43198759621 is an apocalyptic number.

It is an amenable number.

43198759621 is a deficient number, since it is larger than the sum of its proper divisors (1).

43198759621 is an equidigital number, since it uses as much as digits as its factorization.

43198759621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 55.

The spelling of 43198759621 in words is "forty-three billion, one hundred ninety-eight million, seven hundred fifty-nine thousand, six hundred twenty-one".