499820013421 has 4 divisors (see below), whose sum is σ = 500899538752. Its totient is φ = 498740488092.

The previous prime is 499820013401. The next prime is 499820013463. The reversal of 499820013421 is 124310028994.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124310028994 = 2 ⋅62155014497.

It is a cyclic number.

It is not a de Polignac number, because 499820013421 - 2⁵ = 499820013389 is a prime.

It is the 706980-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499820013401) by changing a digit.

It is a nontrivial repunit in base 706979.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539761971 + ... + 539762896.

It is an arithmetic number, because the mean of its divisors is an integer number (125224884688).

Almost surely, 2^499820013421 is an apocalyptic number.

It is an amenable number.

499820013421 is a deficient number, since it is larger than the sum of its proper divisors (1079525331).

499820013421 is a wasteful number, since it uses less digits than its factorization.

499820013421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079525330.

The product of its (nonzero) digits is 124416, while the sum is 43.

The spelling of 499820013421 in words is "four hundred ninety-nine billion, eight hundred twenty million, thirteen thousand, four hundred twenty-one".