21452111412240 has 80 divisors (see below), whose sum is σ = 66555568670976. Its totient is φ = 5715915878400.

The previous prime is 21452111412191. The next prime is 21452111412253. The reversal of 21452111412240 is 4221411125412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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 = 21452111412198 and 21452111412207.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36009921 + ... + 36600800.

Almost surely, 2^{21452111412240} is an apocalyptic number.

21452111412240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21452111412240 is an abundant number, since it is smaller than the sum of its proper divisors (45103457258736).

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

21452111412240 is a wasteful number, since it uses less digits than its factorization.

21452111412240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72611968 (or 72611962 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

Adding to 21452111412240 its reverse (4221411125412), we get a palindrome (25673522537652).

The spelling of 21452111412240 in words is "twenty-one trillion, four hundred fifty-two billion, one hundred eleven million, four hundred twelve thousand, two hundred forty".