1011211111021 has 4 divisors (see below), whose sum is σ = 1011305004544. Its totient is φ = 1011117217500.

The previous prime is 1011211111019. The next prime is 1011211111067. The reversal of 1011211111021 is 1201111121101.

1011211111021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1011211111021 - 2¹ = 1011211111019 is a prime.

It is a super-2 number, since 2×1011211111021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011211110992 and 1011211111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011211111321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46930605 + ... + 46952146.

It is an arithmetic number, because the mean of its divisors is an integer number (252826251136).

Almost surely, 2^{1011211111021} is an apocalyptic number.

It is an amenable number.

1011211111021 is a deficient number, since it is larger than the sum of its proper divisors (93893523).

1011211111021 is an equidigital number, since it uses as much as digits as its factorization.

1011211111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93893522.

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

Adding to 1011211111021 its reverse (1201111121101), we get a palindrome (2212322232122).

The spelling of 1011211111021 in words is "one trillion, eleven billion, two hundred eleven million, one hundred eleven thousand, twenty-one".