21203012012203 has 4 divisors (see below), whose sum is σ = 24232013728240. Its totient is φ = 18174010296168.

The previous prime is 21203012012197. The next prime is 21203012012309. The reversal of 21203012012203 is 30221021030212.

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 21203012012203 - 2¹⁷ = 21203011881131 is a prime.

It is a super-2 number, since 2×21203012012203² (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 (21203012015203) 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, 1514500858008 + ... + 1514500858021.

It is an arithmetic number, because the mean of its divisors is an integer number (6058003432060).

Almost surely, 2^{21203012012203} is an apocalyptic number.

21203012012203 is a deficient number, since it is larger than the sum of its proper divisors (3029001716037).

21203012012203 is an equidigital number, since it uses as much as digits as its factorization.

21203012012203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3029001716036.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21203012012203 its reverse (30221021030212), we get a palindrome (51424033042415).

The spelling of 21203012012203 in words is "twenty-one trillion, two hundred three billion, twelve million, twelve thousand, two hundred three".