21021212333003 has 4 divisors (see below), whose sum is σ = 21035348993760. Its totient is φ = 21007075672248.

The previous prime is 21021212332979. The next prime is 21021212333021. The reversal of 21021212333003 is 30033321212012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021212333003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21021212333003.

It is not an unprimeable number, because it can be changed into a prime (21021212333503) 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, 7068328148 + ... + 7068331121.

It is an arithmetic number, because the mean of its divisors is an integer number (5258837248440).

Almost surely, 2^{21021212333003} is an apocalyptic number.

21021212333003 is a deficient number, since it is larger than the sum of its proper divisors (14136660757).

21021212333003 is a wasteful number, since it uses less digits than its factorization.

21021212333003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14136660756.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21021212333003 its reverse (30033321212012), we get a palindrome (51054533545015).

The spelling of 21021212333003 in words is "twenty-one trillion, twenty-one billion, two hundred twelve million, three hundred thirty-three thousand, three".