21223302420 has 24 divisors (see below), whose sum is σ = 59425246944. Its totient is φ = 5659547296.

The previous prime is 21223302389. The next prime is 21223302427. The reversal of 21223302420 is 2420332212.

It is a super-2 number, since 2×21223302420² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223302427) 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, 176860794 + ... + 176860913.

It is an arithmetic number, because the mean of its divisors is an integer number (2476051956).

Almost surely, 2^21223302420 is an apocalyptic number.

21223302420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223302420 is an abundant number, since it is smaller than the sum of its proper divisors (38201944524).

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

21223302420 is a wasteful number, since it uses less digits than its factorization.

21223302420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353721719 (or 353721717 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 21223302420 its reverse (2420332212), we get a palindrome (23643634632).

The spelling of 21223302420 in words is "twenty-one billion, two hundred twenty-three million, three hundred two thousand, four hundred twenty".