101220001 has 2 divisors, whose sum is σ = 101220002. Its totient is φ = 101220000.

The previous prime is 101219977. The next prime is 101220013. The reversal of 101220001 is 100022101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67568400 + 33651601 = 8220^2 + 5801^2 .

It is a cyclic number.

It is not a de Polignac number, because 101220001 - 2⁵ = 101219969 is a prime.

It is not a weakly prime, because it can be changed into another prime (101226001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610000 + 50610001.

It is an arithmetic number, because the mean of its divisors is an integer number (50610001).

Almost surely, 2^101220001 is an apocalyptic number.

It is an amenable number.

101220001 is a deficient number, since it is larger than the sum of its proper divisors (1).

101220001 is an equidigital number, since it uses as much as digits as its factorization.

101220001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 101220001 is about 10060.8151260223. The cubic root of 101220001 is about 466.0388398064.

Adding to 101220001 its reverse (100022101), we get a palindrome (201242102).

The spelling of 101220001 in words is "one hundred one million, two hundred twenty thousand, one".