21034553340 has 24 divisors (see below), whose sum is σ = 58896749520. Its totient is φ = 5609214208.

The previous prime is 21034553311. The next prime is 21034553341. The reversal of 21034553340 is 4335543012.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 21034553298 and 21034553307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034553341) 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, 175287885 + ... + 175288004.

It is an arithmetic number, because the mean of its divisors is an integer number (2454031230).

Almost surely, 2^21034553340 is an apocalyptic number.

21034553340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21034553340 is an abundant number, since it is smaller than the sum of its proper divisors (37862196180).

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

21034553340 is a wasteful number, since it uses less digits than its factorization.

21034553340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350575901 (or 350575899 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

The spelling of 21034553340 in words is "twenty-one billion, thirty-four million, five hundred fifty-three thousand, three hundred forty".