21000020303121 has 8 divisors (see below), whose sum is σ = 28003919776800. Its totient is φ = 13998067182432.

The previous prime is 21000020303071. The next prime is 21000020303131. The reversal of 21000020303121 is 12130302000012.

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

It is not a de Polignac number, because 21000020303121 - 2¹⁵ = 21000020270353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21000020303121.

It is not an unprimeable number, because it can be changed into a prime (21000020303131) 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, 486563071 + ... + 486606228.

It is an arithmetic number, because the mean of its divisors is an integer number (3500489972100).

Almost surely, 2^{21000020303121} is an apocalyptic number.

It is an amenable number.

21000020303121 is a deficient number, since it is larger than the sum of its proper divisors (7003899473679).

21000020303121 is an equidigital number, since it uses as much as digits as its factorization.

21000020303121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973176495.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21000020303121 its reverse (12130302000012), we get a palindrome (33130322303133).

The spelling of 21000020303121 in words is "twenty-one trillion, twenty million, three hundred three thousand, one hundred twenty-one".