1011211001001 has 12 divisors (see below), whose sum is σ = 1494606441328. Its totient is φ = 658462977144.

The previous prime is 1011211000999. The next prime is 1011211001039. The reversal of 1011211001001 is 1001001121101.

It is not a de Polignac number, because 1011211001001 - 2¹ = 1011211000999 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011211001081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1306473775 + ... + 1306474548.

Almost surely, 2^{1011211001001} is an apocalyptic number.

It is an amenable number.

1011211001001 is a deficient number, since it is larger than the sum of its proper divisors (483395440327).

1011211001001 is a wasteful number, since it uses less digits than its factorization.

1011211001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612948372 (or 2612948369 counting only the distinct ones).

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

Adding to 1011211001001 its reverse (1001001121101), we get a palindrome (2012212122102).

The spelling of 1011211001001 in words is "one trillion, eleven billion, two hundred eleven million, one thousand, one".