42021321473 has 2 divisors, whose sum is σ = 42021321474. Its totient is φ = 42021321472.

The previous prime is 42021321337. The next prime is 42021321487. The reversal of 42021321473 is 37412312024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36142572544 + 5878748929 = 190112^2 + 76673^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42021321473 is a prime.

It is not a weakly prime, because it can be changed into another prime (42027321473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21010660736 + 21010660737.

It is an arithmetic number, because the mean of its divisors is an integer number (21010660737).

Almost surely, 2^42021321473 is an apocalyptic number.

It is an amenable number.

42021321473 is a deficient number, since it is larger than the sum of its proper divisors (1).

42021321473 is an equidigital number, since it uses as much as digits as its factorization.

42021321473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 29.

Adding to 42021321473 its reverse (37412312024), we get a palindrome (79433633497).

The spelling of 42021321473 in words is "forty-two billion, twenty-one million, three hundred twenty-one thousand, four hundred seventy-three".