21121113404 has 12 divisors (see below), whose sum is σ = 37289046144. Its totient is φ = 10467100224.

The previous prime is 21121113401. The next prime is 21121113467. The reversal of 21121113404 is 40431112112.

It is a super-2 number, since 2×21121113404² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121113401) 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, 23363612 + ... + 23364515.

It is an arithmetic number, because the mean of its divisors is an integer number (3107420512).

Almost surely, 2^21121113404 is an apocalyptic number.

It is an amenable number.

21121113404 is a deficient number, since it is larger than the sum of its proper divisors (16167932740).

21121113404 is a wasteful number, since it uses less digits than its factorization.

21121113404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46728244 (or 46728242 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21121113404 its reverse (40431112112), we get a palindrome (61552225516).

The spelling of 21121113404 in words is "twenty-one billion, one hundred twenty-one million, one hundred thirteen thousand, four hundred four".