21200125511001 has 4 divisors (see below), whose sum is σ = 28266834014672. Its totient is φ = 14133417007332.

The previous prime is 21200125510979. The next prime is 21200125511039. The reversal of 21200125511001 is 10011552100212.

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 not a de Polignac number, because 21200125511001 - 2¹⁸ = 21200125248857 is a prime.

It is a super-2 number, since 2×21200125511001² (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 (21200125511501) 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, 3533354251831 + ... + 3533354251836.

It is an arithmetic number, because the mean of its divisors is an integer number (7066708503668).

Almost surely, 2^{21200125511001} is an apocalyptic number.

It is an amenable number.

21200125511001 is a deficient number, since it is larger than the sum of its proper divisors (7066708503671).

21200125511001 is an equidigital number, since it uses as much as digits as its factorization.

21200125511001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7066708503670.

The product of its (nonzero) digits is 200, while the sum is 21.

Adding to 21200125511001 its reverse (10011552100212), we get a palindrome (31211677611213).

The spelling of 21200125511001 in words is "twenty-one trillion, two hundred billion, one hundred twenty-five million, five hundred eleven thousand, one".