21820227242 has 16 divisors (see below), whose sum is σ = 35853992064. Its totient is φ = 9877128000.

The previous prime is 21820227203. The next prime is 21820227257. The reversal of 21820227242 is 24272202812.

It is a super-2 number, since 2×21820227242² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21820227199 and 21820227208.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2052434 + ... + 2063037.

It is an arithmetic number, because the mean of its divisors is an integer number (2240874504).

Almost surely, 2^21820227242 is an apocalyptic number.

21820227242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21820227242 is a deficient number, since it is larger than the sum of its proper divisors (14033764822).

21820227242 is a wasteful number, since it uses less digits than its factorization.

21820227242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4115725.

The product of its (nonzero) digits is 14336, while the sum is 32.

The spelling of 21820227242 in words is "twenty-one billion, eight hundred twenty million, two hundred twenty-seven thousand, two hundred forty-two".