21145833834 has 16 divisors (see below), whose sum is σ = 42297024960. Its totient is φ = 7047718400.

The previous prime is 21145833833. The next prime is 21145833869. The reversal of 21145833834 is 43833854112.

It is not an unprimeable number, because it can be changed into a prime (21145833833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170967 + ... + 267434.

It is an arithmetic number, because the mean of its divisors is an integer number (2643564060).

Almost surely, 2^21145833834 is an apocalyptic number.

21145833834 is an abundant number, since it is smaller than the sum of its proper divisors (21151191126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21145833834 is a wasteful number, since it uses less digits than its factorization.

21145833834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446445.

The product of its digits is 276480, while the sum is 42.

The spelling of 21145833834 in words is "twenty-one billion, one hundred forty-five million, eight hundred thirty-three thousand, eight hundred thirty-four".