21021212111003 has 16 divisors (see below), whose sum is σ = 23192826491520. Its totient is φ = 18931430798976.

The previous prime is 21021212110999. The next prime is 21021212111017. The reversal of 21021212111003 is 30011121212012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21021212111003 - 2² = 21021212110999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021212111303) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54072248 + ... + 54459621.

It is an arithmetic number, because the mean of its divisors is an integer number (1449551655720).

Almost surely, 2^{21021212111003} is an apocalyptic number.

21021212111003 is a deficient number, since it is larger than the sum of its proper divisors (2171614380517).

21021212111003 is a wasteful number, since it uses less digits than its factorization.

21021212111003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108532246.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21021212111003 its reverse (30011121212012), we get a palindrome (51032333323015).

It can be divided in two parts, 2102121 and 2111003, that added together give a palindrome (4213124).

The spelling of 21021212111003 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, one hundred eleven thousand, three".