21221534411640 has 96 divisors (see below), whose sum is σ = 69033089661120. Its totient is φ = 5653898175744.

The previous prime is 21221534411621. The next prime is 21221534411723. The reversal of 21221534411640 is 4611443512212.

21221534411640 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 1 + 5 + 3 + 4 + 4 + 1 + 1 + 640 = 666.

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 = 21221534411595 and 21221534411604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26572992 + ... + 27359951.

It is an arithmetic number, because the mean of its divisors is an integer number (719094683970).

Almost surely, 2^{21221534411640} is an apocalyptic number.

21221534411640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221534411640 is an abundant number, since it is smaller than the sum of its proper divisors (47811555249480).

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

21221534411640 is a wasteful number, since it uses less digits than its factorization.

21221534411640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53934053 (or 53934046 counting only the distinct ones).

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

Adding to 21221534411640 its reverse (4611443512212), we get a palindrome (25832977923852).

The spelling of 21221534411640 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred thirty-four million, four hundred eleven thousand, six hundred forty".