20011220210 has 16 divisors (see below), whose sum is σ = 36021868992. Its totient is φ = 8004116400.

The previous prime is 20011220197. The next prime is 20011220213. The reversal of 20011220210 is 1202211002.

It is a happy number.

It is a super-2 number, since 2×20011220210² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20011220191 and 20011220200.

It is not an unprimeable number, because it can be changed into a prime (20011220213) 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, 309605 + ... + 368615.

It is an arithmetic number, because the mean of its divisors is an integer number (2251366812).

Almost surely, 2^20011220210 is an apocalyptic number.

20011220210 is a deficient number, since it is larger than the sum of its proper divisors (16010648782).

20011220210 is a wasteful number, since it uses less digits than its factorization.

20011220210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92929.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20011220210 its reverse (1202211002), we get a palindrome (21213431212).

The spelling of 20011220210 in words is "twenty billion, eleven million, two hundred twenty thousand, two hundred ten".