21445505400131 has 8 divisors (see below), whose sum is σ = 21460241431440. Its totient is φ = 21430769869792.

The previous prime is 21445505400103. The next prime is 21445505400139. The reversal of 21445505400131 is 13100450554412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21445505400131 is a prime.

It is a super-2 number, since 2×21445505400131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21445505400091 and 21445505400100.

It is not an unprimeable number, because it can be changed into a prime (21445505400139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135489785 + ... + 135647973.

It is an arithmetic number, because the mean of its divisors is an integer number (2682530178930).

Almost surely, 2^{21445505400131} is an apocalyptic number.

21445505400131 is a deficient number, since it is larger than the sum of its proper divisors (14736031309).

21445505400131 is a wasteful number, since it uses less digits than its factorization.

21445505400131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250485.

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 21445505400131 its reverse (13100450554412), we get a palindrome (34545955954543).

The spelling of 21445505400131 in words is "twenty-one trillion, four hundred forty-five billion, five hundred five million, four hundred thousand, one hundred thirty-one".