921407697892 has 36 divisors (see below), whose sum is σ = 1781374226940. Its totient is φ = 416695639360.

The previous prime is 921407697887. The next prime is 921407697893. The reversal of 921407697892 is 298796704129.

921407697892 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 2 ways, for example, as 641879778276 + 279527919616 = 801174^2 + 528704^2 .

It is not an unprimeable number, because it can be changed into a prime (921407697893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4736467 + ... + 4927162.

It is an arithmetic number, because the mean of its divisors is an integer number (49482617415).

Almost surely, 2^921407697892 is an apocalyptic number.

It is an amenable number.

921407697892 is a deficient number, since it is larger than the sum of its proper divisors (859966529048).

921407697892 is a wasteful number, since it uses less digits than its factorization.

921407697892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9663852 (or 9663839 counting only the distinct ones).

The product of its (nonzero) digits is 27433728, while the sum is 64.

The spelling of 921407697892 in words is "nine hundred twenty-one billion, four hundred seven million, six hundred ninety-seven thousand, eight hundred ninety-two".