40001021425 has 6 divisors (see below), whose sum is σ = 49601266598. Its totient is φ = 32000817120.

The previous prime is 40001021407. The next prime is 40001021447. The reversal of 40001021425 is 52412010004.

40001021425 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 262991089 + 39738030336 = 16217^2 + 199344^2 .

It is not a de Polignac number, because 40001021425 - 2¹³ = 40001013233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 800020404 + ... + 800020453.

Almost surely, 2^40001021425 is an apocalyptic number.

It is an amenable number.

40001021425 is a deficient number, since it is larger than the sum of its proper divisors (9600245173).

40001021425 is a wasteful number, since it uses less digits than its factorization.

40001021425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600040867 (or 1600040862 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

Adding to 40001021425 its reverse (52412010004), we get a palindrome (92413031429).

The spelling of 40001021425 in words is "forty billion, one million, twenty-one thousand, four hundred twenty-five".