21821476113 has 16 divisors (see below), whose sum is σ = 33733683840. Its totient is φ = 13915143792.

The previous prime is 21821476109. The next prime is 21821476129. The reversal of 21821476113 is 31167412812.

21821476113 is a `hidden beast` number, since 2 + 18 + 21 + 4 + 7 + 611 + 3 = 666.

It is not a de Polignac number, because 21821476113 - 2² = 21821476109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21821476153) 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, 17569006 + ... + 17570247.

It is an arithmetic number, because the mean of its divisors is an integer number (2108355240).

Almost surely, 2^21821476113 is an apocalyptic number.

21821476113 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21821476113 is a deficient number, since it is larger than the sum of its proper divisors (11912207727).

21821476113 is a wasteful number, since it uses less digits than its factorization.

21821476113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35139285 (or 35139279 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

Adding to 21821476113 its reverse (31167412812), we get a palindrome (52988888925).

The spelling of 21821476113 in words is "twenty-one billion, eight hundred twenty-one million, four hundred seventy-six thousand, one hundred thirteen".