1201111021 has 8 divisors (see below), whose sum is σ = 1313676000. Its totient is φ = 1089108240.

The previous prime is 1201111019. The next prime is 1201111091.

1201111021 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 1201111021 - 2¹ = 1201111019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201110989 and 1201111007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201111091) 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, 136071 + ... + 144628.

It is an arithmetic number, because the mean of its divisors is an integer number (164209500).

Almost surely, 2^1201111021 is an apocalyptic number.

1201111021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201111021 is a deficient number, since it is larger than the sum of its proper divisors (112564979).

1201111021 is a wasteful number, since it uses less digits than its factorization.

1201111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281099.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1201111021 is about 34657.0486481466. The cubic root of 1201111021 is about 1062.9864224630.

It can be divided in two parts, 12011 and 11021, that multiplied together give a palindrome (132373231).

The spelling of 1201111021 in words is "one billion, two hundred one million, one hundred eleven thousand, twenty-one".