21221021118 has 16 divisors (see below), whose sum is σ = 46300409856. Its totient is φ = 6430612440.

The previous prime is 21221021113. The next prime is 21221021119. The reversal of 21221021118 is 81112012212.

It is a super-4 number, since 4×21221021118⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21221021094 and 21221021103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221021113) 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, 160765246 + ... + 160765377.

It is an arithmetic number, because the mean of its divisors is an integer number (2893775616).

Almost surely, 2^21221021118 is an apocalyptic number.

21221021118 is an abundant number, since it is smaller than the sum of its proper divisors (25079388738).

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

21221021118 is a wasteful number, since it uses less digits than its factorization.

21221021118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321530639.

The product of its (nonzero) digits is 128, while the sum is 21.

The spelling of 21221021118 in words is "twenty-one billion, two hundred twenty-one million, twenty-one thousand, one hundred eighteen".