1216010101 has 2 divisors, whose sum is σ = 1216010102. Its totient is φ = 1216010100.

The previous prime is 1216010083. The next prime is 1216010137. The reversal of 1216010101 is 1010106121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 686964100 + 529046001 = 26210^2 + 23001^2 .

It is an emirp because it is prime and its reverse (1010106121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216010101 - 2¹³ = 1216001909 is a prime.

1216010101 is a modest number, since divided by 10101 gives 1216 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216010401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608005050 + 608005051.

It is an arithmetic number, because the mean of its divisors is an integer number (608005051).

Almost surely, 2^1216010101 is an apocalyptic number.

It is an amenable number.

1216010101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216010101 is an equidigital number, since it uses as much as digits as its factorization.

1216010101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1216010101 is about 34871.3363810451. The cubic root of 1216010101 is about 1067.3636149110.

Adding to 1216010101 its reverse (1010106121), we get a palindrome (2226116222).

The spelling of 1216010101 in words is "one billion, two hundred sixteen million, ten thousand, one hundred one".