21257755200001 has 4 divisors (see below), whose sum is σ = 22182005426112. Its totient is φ = 20333504973892.

The previous prime is 21257755199999. The next prime is 21257755200023. The reversal of 21257755200001 is 10000255775212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21257755200001 - 2¹ = 21257755199999 is a prime.

It is a super-2 number, since 2×21257755200001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21257755200091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462125113021 + ... + 462125113066.

It is an arithmetic number, because the mean of its divisors is an integer number (5545501356528).

Almost surely, 2^{21257755200001} is an apocalyptic number.

It is an amenable number.

21257755200001 is a deficient number, since it is larger than the sum of its proper divisors (924250226111).

21257755200001 is an equidigital number, since it uses as much as digits as its factorization.

21257755200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924250226110.

The product of its (nonzero) digits is 49000, while the sum is 37.

The spelling of 21257755200001 in words is "twenty-one trillion, two hundred fifty-seven billion, seven hundred fifty-five million, two hundred thousand, one".