821428700575 has 24 divisors (see below), whose sum is σ = 1170176532480. Its totient is φ = 560316338400.

The previous prime is 821428700563. The next prime is 821428700581. The reversal of 821428700575 is 575007824128.

It is a happy number.

It is not a de Polignac number, because 821428700575 - 2¹⁹ = 821428176287 is a prime.

It is a super-2 number, since 2×821428700575² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12254215 + ... + 12321064.

It is an arithmetic number, because the mean of its divisors is an integer number (48757355520).

Almost surely, 2^821428700575 is an apocalyptic number.

821428700575 is a deficient number, since it is larger than the sum of its proper divisors (348747831905).

821428700575 is a wasteful number, since it uses less digits than its factorization.

821428700575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24575487 (or 24575482 counting only the distinct ones).

The product of its (nonzero) digits is 1254400, while the sum is 49.

The spelling of 821428700575 in words is "eight hundred twenty-one billion, four hundred twenty-eight million, seven hundred thousand, five hundred seventy-five".