20121220210 has 128 divisors (see below), whose sum is σ = 47519539200. Its totient is φ = 5956104960.

The previous prime is 20121220187. The next prime is 20121220241. The reversal of 20121220210 is 1202212102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1358545 + ... + 1373275.

It is an arithmetic number, because the mean of its divisors is an integer number (371246400).

Almost surely, 2^20121220210 is an apocalyptic number.

20121220210 is an abundant number, since it is smaller than the sum of its proper divisors (27398318990).

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

20121220210 is a wasteful number, since it uses less digits than its factorization.

20121220210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14856.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20121220210 its reverse (1202212102), we get a palindrome (21323432312).

The spelling of 20121220210 in words is "twenty billion, one hundred twenty-one million, two hundred twenty thousand, two hundred ten".