21000212330021 has 8 divisors (see below), whose sum is σ = 22416831547200. Its totient is φ = 19614727601280.

The previous prime is 21000212330017. The next prime is 21000212330039. The reversal of 21000212330021 is 12003321200012.

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 21000212330021 - 2² = 21000212330017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000217330021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7783620716 + ... + 7783623413.

It is an arithmetic number, because the mean of its divisors is an integer number (2802103943400).

Almost surely, 2^{21000212330021} is an apocalyptic number.

It is an amenable number.

21000212330021 is a deficient number, since it is larger than the sum of its proper divisors (1416619217179).

21000212330021 is a wasteful number, since it uses less digits than its factorization.

21000212330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15567244219.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21000212330021 its reverse (12003321200012), we get a palindrome (33003533530033).

The spelling of 21000212330021 in words is "twenty-one trillion, two hundred twelve million, three hundred thirty thousand, twenty-one".