20001021021210 has 16 divisors (see below), whose sum is σ = 48002450450976. Its totient is φ = 5333605605648.

The previous prime is 20001021021197. The next prime is 20001021021217. The reversal of 20001021021210 is 1212012010002.

It is a super-2 number, since 2×20001021021210² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20001021021217) 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, 333350350324 + ... + 333350350383.

It is an arithmetic number, because the mean of its divisors is an integer number (3000153153186).

Almost surely, 2^{20001021021210} is an apocalyptic number.

20001021021210 is an abundant number, since it is smaller than the sum of its proper divisors (28001429429766).

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

20001021021210 is a wasteful number, since it uses less digits than its factorization.

20001021021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666700700717.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20001021021210 its reverse (1212012010002), we get a palindrome (21213033031212).

The spelling of 20001021021210 in words is "twenty trillion, one billion, twenty-one million, twenty-one thousand, two hundred ten".