21033142220 has 48 divisors (see below), whose sum is σ = 47650262688. Its totient is φ = 7768949760.

The previous prime is 21033142219. The next prime is 21033142259. The reversal of 21033142220 is 2224133012.

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 = 21033142192 and 21033142201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 565586 + ... + 601625.

It is an arithmetic number, because the mean of its divisors is an integer number (992713806).

Almost surely, 2^21033142220 is an apocalyptic number.

21033142220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21033142220 is an abundant number, since it is smaller than the sum of its proper divisors (26617120468).

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

21033142220 is a wasteful number, since it uses less digits than its factorization.

21033142220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167290 (or 1167288 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21033142220 its reverse (2224133012), we get a palindrome (23257275232).

The spelling of 21033142220 in words is "twenty-one billion, thirty-three million, one hundred forty-two thousand, two hundred twenty".