21214320453440 has 56 divisors (see below), whose sum is σ = 53175369046560. Its totient is φ = 8039110906368.

The previous prime is 21214320453437. The next prime is 21214320453553. The reversal of 21214320453440 is 4435402341212.

It is a self number, because there is not a number n which added to its sum of digits gives 21214320453440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1744592642 + ... + 1744604801.

Almost surely, 2^{21214320453440} is an apocalyptic number.

21214320453440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21214320453440 is an abundant number, since it is smaller than the sum of its proper divisors (31961048593120).

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

21214320453440 is a wasteful number, since it uses less digits than its factorization.

21214320453440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3489197479 (or 3489197469 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 21214320453440 its reverse (4435402341212), we get a palindrome (25649722794652).

The spelling of 21214320453440 in words is "twenty-one trillion, two hundred fourteen billion, three hundred twenty million, four hundred fifty-three thousand, four hundred forty".