21455034342240 has 48 divisors (see below), whose sum is σ = 67583358179568. Its totient is φ = 5721342491136.

The previous prime is 21455034342239. The next prime is 21455034342241. The reversal of 21455034342240 is 4224343055412.

It is an interprime number because it is at equal distance from previous prime (21455034342239) and next prime (21455034342241).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455034342241) 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, 22348993627 + ... + 22348994586.

It is an arithmetic number, because the mean of its divisors is an integer number (1407986628741).

Almost surely, 2^{21455034342240} is an apocalyptic number.

21455034342240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21455034342240 is an abundant number, since it is smaller than the sum of its proper divisors (46128323837328).

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

21455034342240 is a wasteful number, since it uses less digits than its factorization.

21455034342240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44697988231 (or 44697988223 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 39.

Adding to 21455034342240 its reverse (4224343055412), we get a palindrome (25679377397652).

The spelling of 21455034342240 in words is "twenty-one trillion, four hundred fifty-five billion, thirty-four million, three hundred forty-two thousand, two hundred forty".