20001121210 has 32 divisors (see below), whose sum is σ = 43310701440. Its totient is φ = 6496604352.

The previous prime is 20001121201. The next prime is 20001121271. The reversal of 20001121210 is 1212110002.

It is a super-2 number, since 2×20001121210² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7517889 + ... + 7520548.

It is an arithmetic number, because the mean of its divisors is an integer number (1353459420).

Almost surely, 2^20001121210 is an apocalyptic number.

20001121210 is an abundant number, since it is smaller than the sum of its proper divisors (23309580230).

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

20001121210 is a wasteful number, since it uses less digits than its factorization.

20001121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15038470.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20001121210 its reverse (1212110002), we get a palindrome (21213231212).

The spelling of 20001121210 in words is "twenty billion, one million, one hundred twenty-one thousand, two hundred ten".