42086956421 has 2 divisors, whose sum is σ = 42086956422. Its totient is φ = 42086956420.

The previous prime is 42086956393. The next prime is 42086956427. The reversal of 42086956421 is 12465968024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23913220321 + 18173736100 = 154639^2 + 134810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42086956421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42086956427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21043478210 + 21043478211.

It is an arithmetic number, because the mean of its divisors is an integer number (21043478211).

Almost surely, 2^42086956421 is an apocalyptic number.

It is an amenable number.

42086956421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42086956421 is an equidigital number, since it uses as much as digits as its factorization.

42086956421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 42086956421 in words is "forty-two billion, eighty-six million, nine hundred fifty-six thousand, four hundred twenty-one".