521419821 has 16 divisors (see below), whose sum is σ = 781259136. Its totient is φ = 306922176.

The previous prime is 521419819. The next prime is 521419823. The reversal of 521419821 is 128914125.

It is an interprime number because it is at equal distance from previous prime (521419819) and next prime (521419823).

It is not a de Polignac number, because 521419821 - 2¹ = 521419819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521419823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 289750 + ... + 291543.

It is an arithmetic number, because the mean of its divisors is an integer number (48828696).

Almost surely, 2^521419821 is an apocalyptic number.

It is an amenable number.

521419821 is a deficient number, since it is larger than the sum of its proper divisors (259839315).

521419821 is a wasteful number, since it uses less digits than its factorization.

521419821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581332.

The product of its digits is 5760, while the sum is 33.

The square root of 521419821 is about 22834.6189151472. The cubic root of 521419821 is about 804.8763726151.

The spelling of 521419821 in words is "five hundred twenty-one million, four hundred nineteen thousand, eight hundred twenty-one".