20120220101 has 2 divisors, whose sum is σ = 20120220102. Its totient is φ = 20120220100.

The previous prime is 20120220089. The next prime is 20120220139. The reversal of 20120220101 is 10102202102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19043724001 + 1076496100 = 137999^2 + 32810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120220101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120220161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060110050 + 10060110051.

It is an arithmetic number, because the mean of its divisors is an integer number (10060110051).

Almost surely, 2^20120220101 is an apocalyptic number.

It is an amenable number.

20120220101 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120220101 is an equidigital number, since it uses as much as digits as its factorization.

20120220101 is an evil number, because the sum of its binary digits is even.

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

Adding to 20120220101 its reverse (10102202102), we get a palindrome (30222422203).

The spelling of 20120220101 in words is "twenty billion, one hundred twenty million, two hundred twenty thousand, one hundred one".