21364511212440 has 96 divisors (see below), whose sum is σ = 75746903403600. Its totient is φ = 5179275444480.

The previous prime is 21364511212427. The next prime is 21364511212453. The reversal of 21364511212440 is 4421211546312.

21364511212440 is a `hidden beast` number, since 2 + 1 + 3 + 64 + 511 + 21 + 24 + 40 = 666.

It is an interprime number because it is at equal distance from previous prime (21364511212427) and next prime (21364511212453).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21364511212395 and 21364511212404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2697535335 + ... + 2697543254.

Almost surely, 2^{21364511212440} is an apocalyptic number.

21364511212440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21364511212440 is an abundant number, since it is smaller than the sum of its proper divisors (54382392191160).

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

21364511212440 is a wasteful number, since it uses less digits than its factorization.

21364511212440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5395078617 (or 5395078610 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

Adding to 21364511212440 its reverse (4421211546312), we get a palindrome (25785722758752).

The spelling of 21364511212440 in words is "twenty-one trillion, three hundred sixty-four billion, five hundred eleven million, two hundred twelve thousand, four hundred forty".