21020333012 has 36 divisors (see below), whose sum is σ = 43030522080. Its totient is φ = 8958371184.

The previous prime is 21020332999. The next prime is 21020333017. The reversal of 21020333012 is 21033302012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020333017) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 264488 + ... + 334655.

It is an arithmetic number, because the mean of its divisors is an integer number (1195292280).

Almost surely, 2^21020333012 is an apocalyptic number.

It is an amenable number.

21020333012 is an abundant number, since it is smaller than the sum of its proper divisors (22010189068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21020333012 is a wasteful number, since it uses less digits than its factorization.

21020333012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599340 (or 599331 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21020333012 its reverse (21033302012), we get a palindrome (42053635024).

The spelling of 21020333012 in words is "twenty-one billion, twenty million, three hundred thirty-three thousand, twelve".