21012120212203 has 8 divisors (see below), whose sum is σ = 21525696528336. Its totient is φ = 20498595590400.

The previous prime is 21012120212141. The next prime is 21012120212233. The reversal of 21012120212203 is 30221202121012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21012120212203 - 2⁴¹ = 18813096956651 is a prime.

It is a super-2 number, since 2×21012120212203² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21012120212233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12100078 + ... + 13727203.

It is an arithmetic number, because the mean of its divisors is an integer number (2690712066042).

Almost surely, 2^{21012120212203} is an apocalyptic number.

21012120212203 is a deficient number, since it is larger than the sum of its proper divisors (513576316133).

21012120212203 is a wasteful number, since it uses less digits than its factorization.

21012120212203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25847165.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21012120212203 its reverse (30221202121012), we get a palindrome (51233322333215).

The spelling of 21012120212203 in words is "twenty-one trillion, twelve billion, one hundred twenty million, two hundred twelve thousand, two hundred three".