1201101021 has 8 divisors (see below), whose sum is σ = 1779408960. Its totient is φ = 800733996.

The previous prime is 1201101019. The next prime is 1201101029. The reversal of 1201101021 is 1201011021.

It is a happy number.

It is not a de Polignac number, because 1201101021 - 2¹ = 1201101019 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 1201100994 and 1201101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201101029) 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, 22242585 + ... + 22242638.

It is an arithmetic number, because the mean of its divisors is an integer number (222426120).

Almost surely, 2^1201101021 is an apocalyptic number.

It is an amenable number.

1201101021 is a deficient number, since it is larger than the sum of its proper divisors (578307939).

1201101021 is an equidigital number, since it uses as much as digits as its factorization.

1201101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44485232 (or 44485226 counting only the distinct ones).

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

The square root of 1201101021 is about 34656.9043770502. The cubic root of 1201101021 is about 1062.9834724460.

Adding to 1201101021 its reverse (1201011021), we get a palindrome (2402112042).

Subtracting from 1201101021 its reverse (1201011021), we obtain a square (90000 = 300²).

The spelling of 1201101021 in words is "one billion, two hundred one million, one hundred one thousand, twenty-one".