10400047921 has 2 divisors, whose sum is σ = 10400047922. Its totient is φ = 10400047920.

The previous prime is 10400047909. The next prime is 10400047939. The reversal of 10400047921 is 12974000401.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8351218225 + 2048829696 = 91385^2 + 45264^2 .

It is a cyclic number.

It is not a de Polignac number, because 10400047921 - 2⁹ = 10400047409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10400047921.

It is not a weakly prime, because it can be changed into another prime (10400047961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5200023960 + 5200023961.

It is an arithmetic number, because the mean of its divisors is an integer number (5200023961).

Almost surely, 2^10400047921 is an apocalyptic number.

It is an amenable number.

10400047921 is a deficient number, since it is larger than the sum of its proper divisors (1).

10400047921 is an equidigital number, since it uses as much as digits as its factorization.

10400047921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The spelling of 10400047921 in words is "ten billion, four hundred million, forty-seven thousand, nine hundred twenty-one".