21000124443203 has 4 divisors (see below), whose sum is σ = 22105394150760. Its totient is φ = 19894854735648.

The previous prime is 21000124443197. The next prime is 21000124443253. The reversal of 21000124443203 is 30234442100012.

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 21000124443203 - 2²⁴ = 21000107665987 is a prime.

It is a super-2 number, since 2×21000124443203² (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 (21000124443253) 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, 552634853750 + ... + 552634853787.

It is an arithmetic number, because the mean of its divisors is an integer number (5526348537690).

Almost surely, 2^{21000124443203} is an apocalyptic number.

21000124443203 is a deficient number, since it is larger than the sum of its proper divisors (1105269707557).

21000124443203 is a wasteful number, since it uses less digits than its factorization.

21000124443203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105269707556.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21000124443203 its reverse (30234442100012), we get a palindrome (51234566543215).

The spelling of 21000124443203 in words is "twenty-one trillion, one hundred twenty-four million, four hundred forty-three thousand, two hundred three".