20120201081 has 2 divisors, whose sum is σ = 20120201082. Its totient is φ = 20120201080.

The previous prime is 20120201077. The next prime is 20120201137. The reversal of 20120201081 is 18010202102.

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., 19932921856 + 187279225 = 141184^2 + 13685^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120201081 - 2² = 20120201077 is a prime.

It is a super-2 number, since 2×20120201081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20120201071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060100540 + 10060100541.

It is an arithmetic number, because the mean of its divisors is an integer number (10060100541).

Almost surely, 2^20120201081 is an apocalyptic number.

It is an amenable number.

20120201081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120201081 is an equidigital number, since it uses as much as digits as its factorization.

20120201081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20120201081 its reverse (18010202102), we get a palindrome (38130403183).

The spelling of 20120201081 in words is "twenty billion, one hundred twenty million, two hundred one thousand, eighty-one".