40747047421 has 2 divisors, whose sum is σ = 40747047422. Its totient is φ = 40747047420.

The previous prime is 40747047347. The next prime is 40747047427. The reversal of 40747047421 is 12474074704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39366924921 + 1380122500 = 198411^2 + 37150^2 .

It is a cyclic number.

It is not a de Polignac number, because 40747047421 - 2⁹ = 40747046909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40747047427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20373523710 + 20373523711.

It is an arithmetic number, because the mean of its divisors is an integer number (20373523711).

Almost surely, 2^40747047421 is an apocalyptic number.

It is an amenable number.

40747047421 is a deficient number, since it is larger than the sum of its proper divisors (1).

40747047421 is an equidigital number, since it uses as much as digits as its factorization.

40747047421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 175616, while the sum is 40.

The spelling of 40747047421 in words is "forty billion, seven hundred forty-seven million, forty-seven thousand, four hundred twenty-one".