21121100228 has 12 divisors (see below), whose sum is σ = 37068446352. Its totient is φ = 10530115560.

The previous prime is 21121100227. The next prime is 21121100243. The reversal of 21121100228 is 82200112112.

It is a super-2 number, since 2×21121100228² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121100227) 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, 7607078 + ... + 7609853.

It is an arithmetic number, because the mean of its divisors is an integer number (3089037196).

Almost surely, 2^21121100228 is an apocalyptic number.

It is an amenable number.

21121100228 is a deficient number, since it is larger than the sum of its proper divisors (15947346124).

21121100228 is a wasteful number, since it uses less digits than its factorization.

21121100228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15217282 (or 15217280 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

The spelling of 21121100228 in words is "twenty-one billion, one hundred twenty-one million, one hundred thousand, two hundred twenty-eight".