20100211220 has 12 divisors (see below), whose sum is σ = 42210443604. Its totient is φ = 8040084480.

The previous prime is 20100211193. The next prime is 20100211223. The reversal of 20100211220 is 2211200102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12393478276 + 7706732944 = 111326^2 + 87788^2 .

It is a super-2 number, since 2×20100211220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100211223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 502505261 + ... + 502505300.

It is an arithmetic number, because the mean of its divisors is an integer number (3517536967).

Almost surely, 2^20100211220 is an apocalyptic number.

20100211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100211220 is an abundant number, since it is smaller than the sum of its proper divisors (22110232384).

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

20100211220 is a wasteful number, since it uses less digits than its factorization.

20100211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005010570 (or 1005010568 counting only the distinct ones).

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

Adding to 20100211220 its reverse (2211200102), we get a palindrome (22311411322).

The spelling of 20100211220 in words is "twenty billion, one hundred million, two hundred eleven thousand, two hundred twenty".