20121100210 has 64 divisors (see below), whose sum is σ = 38669799168. Its totient is φ = 7511762944.

The previous prime is 20121100177. The next prime is 20121100211. The reversal of 20121100210 is 1200112102.

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

It is not an unprimeable number, because it can be changed into a prime (20121100211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23478102 + ... + 23478958.

It is an arithmetic number, because the mean of its divisors is an integer number (604215612).

Almost surely, 2^20121100210 is an apocalyptic number.

20121100210 is a deficient number, since it is larger than the sum of its proper divisors (18548698958).

20121100210 is a wasteful number, since it uses less digits than its factorization.

20121100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875.

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

Adding to 20121100210 its reverse (1200112102), we get a palindrome (21321212312).

The spelling of 20121100210 in words is "twenty billion, one hundred twenty-one million, one hundred thousand, two hundred ten".