1211010010101 has 24 divisors (see below), whose sum is σ = 1797636259224. Its totient is φ = 785029017600.

The previous prime is 1211010010087. The next prime is 1211010010141. The reversal of 1211010010101 is 1010100101121.

It can be written as a sum of positive squares in 4 ways, for example, as 1118198387601 + 92811622500 = 1057449^2 + 304650^2 .

It is not a de Polignac number, because 1211010010101 - 2⁶ = 1211010010037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211010010141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 602616 + ... + 1668881.

It is an arithmetic number, because the mean of its divisors is an integer number (74901510801).

Almost surely, 2^{1211010010101} is an apocalyptic number.

It is an amenable number.

1211010010101 is a deficient number, since it is larger than the sum of its proper divisors (586626249123).

1211010010101 is a wasteful number, since it uses less digits than its factorization.

1211010010101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2273141 (or 2273138 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 1211010010101 its reverse (1010100101121), we get a palindrome (2221110111222).

The spelling of 1211010010101 in words is "one trillion, two hundred eleven billion, ten million, ten thousand, one hundred one".