101211221008 has 20 divisors (see below), whose sum is σ = 197895796780. Its totient is φ = 50141337984.

The previous prime is 101211220991. The next prime is 101211221009. The reversal of 101211221008 is 800122112101.

It can be written as a sum of positive squares in 2 ways, for example, as 48370084624 + 52841136384 = 219932^2 + 229872^2 .

It is a super-2 number, since 2×101211221008² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (101211221009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29015235 + ... + 29018722.

It is an arithmetic number, because the mean of its divisors is an integer number (9894789839).

Almost surely, 2^101211221008 is an apocalyptic number.

It is an amenable number.

101211221008 is a deficient number, since it is larger than the sum of its proper divisors (96684575772).

101211221008 is a wasteful number, since it uses less digits than its factorization.

101211221008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58034074 (or 58034068 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 101211221008 its reverse (800122112101), we get a palindrome (901333333109).

The spelling of 101211221008 in words is "one hundred one billion, two hundred eleven million, two hundred twenty-one thousand, eight".