1201021101 has 40 divisors (see below), whose sum is σ = 2059447104. Its totient is φ = 683277120.

The previous prime is 1201021069. The next prime is 1201021111. The reversal of 1201021101 is 1011201021.

It is a happy number.

It is not a de Polignac number, because 1201021101 - 2⁵ = 1201021069 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 (1201021111) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 127566 + ... + 136656.

Almost surely, 2^1201021101 is an apocalyptic number.

It is an amenable number.

1201021101 is a deficient number, since it is larger than the sum of its proper divisors (858426003).

1201021101 is an equidigital number, since it uses as much as digits as its factorization.

1201021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9343 (or 9334 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1201021101 is about 34655.7513408669. The cubic root of 1201021101 is about 1062.9598953219.

Adding to 1201021101 its reverse (1011201021), we get a palindrome (2212222122).

It can be divided in two parts, 1201021 and 101, that multiplied together give a palindrome (121303121).

The spelling of 1201021101 in words is "one billion, two hundred one million, twenty-one thousand, one hundred one".