1011111211021 has 8 divisors (see below), whose sum is σ = 1018892818944. Its totient is φ = 1003330560960.

The previous prime is 1011111210961. The next prime is 1011111211039. The reversal of 1011111211021 is 1201121111101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1011111211021 - 2¹⁷ = 1011111079949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011111210992 and 1011111211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011111211081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1957045 + ... + 2419141.

It is an arithmetic number, because the mean of its divisors is an integer number (127361602368).

Almost surely, 2^{1011111211021} is an apocalyptic number.

It is an amenable number.

1011111211021 is a deficient number, since it is larger than the sum of its proper divisors (7781607923).

1011111211021 is a wasteful number, since it uses less digits than its factorization.

1011111211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478931.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1011111211021 its reverse (1201121111101), we get a palindrome (2212232322122).

The spelling of 1011111211021 in words is "one trillion, eleven billion, one hundred eleven million, two hundred eleven thousand, twenty-one".