21820424022 has 24 divisors (see below), whose sum is σ = 47303590464. Its totient is φ = 7269473904.

The previous prime is 21820423997. The next prime is 21820424039. The reversal of 21820424022 is 22042402812.

21820424022 is a `hidden beast` number, since 218 + 2 + 0 + 42 + 402 + 2 = 666.

It is a super-2 number, since 2×21820424022² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 299673 + ... + 365300.

It is an arithmetic number, because the mean of its divisors is an integer number (1970982936).

Almost surely, 2^21820424022 is an apocalyptic number.

21820424022 is an abundant number, since it is smaller than the sum of its proper divisors (25483166442).

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

21820424022 is a wasteful number, since it uses less digits than its factorization.

21820424022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666804 (or 666801 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

Adding to 21820424022 its reverse (22042402812), we get a palindrome (43862826834).

The spelling of 21820424022 in words is "twenty-one billion, eight hundred twenty million, four hundred twenty-four thousand, twenty-two".