21404333020 has 48 divisors (see below), whose sum is σ = 52339670208. Its totient is φ = 7200161280.

The previous prime is 21404333011. The next prime is 21404333029. The reversal of 21404333020 is 2033340412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21404333011) and next prime (21404333029).

It is a junction number, because it is equal to n+sod(n) for n = 21404332982 and 21404333000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404333029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1434921 + ... + 1449760.

It is an arithmetic number, because the mean of its divisors is an integer number (1090409796).

Almost surely, 2^21404333020 is an apocalyptic number.

21404333020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21404333020 is an abundant number, since it is smaller than the sum of its proper divisors (30935337188).

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

21404333020 is a wasteful number, since it uses less digits than its factorization.

21404333020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884750 (or 2884748 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21404333020 its reverse (2033340412), we get a palindrome (23437673432).

The spelling of 21404333020 in words is "twenty-one billion, four hundred four million, three hundred thirty-three thousand, twenty".