821420698545 has 64 divisors (see below), whose sum is σ = 1524027363840. Its totient is φ = 418979683584.

The previous prime is 821420698513. The next prime is 821420698547. The reversal of 821420698545 is 545896024128.

821420698545 is a `hidden beast` number, since 8 + 2 + 1 + 4 + 2 + 0 + 6 + 98 + 545 = 666.

It is not a de Polignac number, because 821420698545 - 2⁵ = 821420698513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 821420698491 and 821420698500.

It is not an unprimeable number, because it can be changed into a prime (821420698547) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25559827 + ... + 25591943.

It is an arithmetic number, because the mean of its divisors is an integer number (23812927560).

Almost surely, 2^821420698545 is an apocalyptic number.

It is an amenable number.

821420698545 is a deficient number, since it is larger than the sum of its proper divisors (702606665295).

821420698545 is a wasteful number, since it uses less digits than its factorization.

821420698545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40391 (or 40385 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 54.

The spelling of 821420698545 in words is "eight hundred twenty-one billion, four hundred twenty million, six hundred ninety-eight thousand, five hundred forty-five".