40225421521 has 2 divisors, whose sum is σ = 40225421522. Its totient is φ = 40225421520.

The previous prime is 40225421473. The next prime is 40225421557. The reversal of 40225421521 is 12512452204.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23882611600 + 16342809921 = 154540^2 + 127839^2 .

It is a cyclic number.

It is not a de Polignac number, because 40225421521 - 2⁹ = 40225421009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40225421521.

It is not a weakly prime, because it can be changed into another prime (40225421021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20112710760 + 20112710761.

It is an arithmetic number, because the mean of its divisors is an integer number (20112710761).

Almost surely, 2^40225421521 is an apocalyptic number.

It is an amenable number.

40225421521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40225421521 is an equidigital number, since it uses as much as digits as its factorization.

40225421521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 40225421521 its reverse (12512452204), we get a palindrome (52737873725).

The spelling of 40225421521 in words is "forty billion, two hundred twenty-five million, four hundred twenty-one thousand, five hundred twenty-one".