21200101001123 has 4 divisors (see below), whose sum is σ = 23127382910328. Its totient is φ = 19272819091920.

The previous prime is 21200101001069. The next prime is 21200101001159. The reversal of 21200101001123 is 32110010100212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21200101001123 - 2⁶ = 21200101001059 is a prime.

It is a super-2 number, since 2×21200101001123² (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 = 21200101001098 and 21200101001107.

It is not an unprimeable number, because it can be changed into a prime (21200101001173) 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, 963640954586 + ... + 963640954607.

It is an arithmetic number, because the mean of its divisors is an integer number (5781845727582).

Almost surely, 2^{21200101001123} is an apocalyptic number.

21200101001123 is a deficient number, since it is larger than the sum of its proper divisors (1927281909205).

21200101001123 is a wasteful number, since it uses less digits than its factorization.

21200101001123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927281909204.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21200101001123 its reverse (32110010100212), we get a palindrome (53310111101335).

The spelling of 21200101001123 in words is "twenty-one trillion, two hundred billion, one hundred one million, one thousand, one hundred twenty-three".