21024014220 has 144 divisors (see below), whose sum is σ = 69619743648. Its totient is φ = 5093114880.

The previous prime is 21024014177. The next prime is 21024014251. The reversal of 21024014220 is 2241042012.

21024014220 is a `hidden beast` number, since 2 + 1 + 0 + 240 + 1 + 422 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21024014193 and 21024014202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3713632 + ... + 3719288.

It is an arithmetic number, because the mean of its divisors is an integer number (483470442).

Almost surely, 2^21024014220 is an apocalyptic number.

21024014220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21024014220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34809871824).

21024014220 is an abundant number, since it is smaller than the sum of its proper divisors (48595729428).

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

21024014220 is a wasteful number, since it uses less digits than its factorization.

21024014220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7560 (or 7555 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21024014220 its reverse (2241042012), we get a palindrome (23265056232).

The spelling of 21024014220 in words is "twenty-one billion, twenty-four million, fourteen thousand, two hundred twenty".