1684475132021 has 4 divisors (see below), whose sum is σ = 1837609234944. Its totient is φ = 1531341029100.

The previous prime is 1684475132017. The next prime is 1684475132023. The reversal of 1684475132021 is 1202315744861.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1684475132021 - 2² = 1684475132017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1684475132023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76567051445 + ... + 76567051466.

It is an arithmetic number, because the mean of its divisors is an integer number (459402308736).

Almost surely, 2^{1684475132021} is an apocalyptic number.

1684475132021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1684475132021 is a deficient number, since it is larger than the sum of its proper divisors (153134102923).

1684475132021 is a wasteful number, since it uses less digits than its factorization.

1684475132021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153134102922.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 1684475132021 in words is "one trillion, six hundred eighty-four billion, four hundred seventy-five million, one hundred thirty-two thousand, twenty-one".