21103333220 has 24 divisors (see below), whose sum is σ = 44365684608. Its totient is φ = 8432060000.

The previous prime is 21103333219. The next prime is 21103333249. The reversal of 21103333220 is 2233330112.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21103333192 and 21103333201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 560906 + ... + 597345.

It is an arithmetic number, because the mean of its divisors is an integer number (1848570192).

Almost surely, 2^21103333220 is an apocalyptic number.

21103333220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21103333220 is an abundant number, since it is smaller than the sum of its proper divisors (23262351388).

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

21103333220 is a wasteful number, since it uses less digits than its factorization.

21103333220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159171 (or 1159169 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21103333220 its reverse (2233330112), we get a palindrome (23336663332).

The spelling of 21103333220 in words is "twenty-one billion, one hundred three million, three hundred thirty-three thousand, two hundred twenty".