1201302021 has 4 divisors (see below), whose sum is σ = 1601736032. Its totient is φ = 800868012.

The previous prime is 1201302019. The next prime is 1201302023. The reversal of 1201302021 is 1202031021.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1202031021 = 3 ⋅400677007.

It is an interprime number because it is at equal distance from previous prime (1201302019) and next prime (1201302023).

It is not a de Polignac number, because 1201302021 - 2¹ = 1201302019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201301988 and 1201302006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201302023) 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, 200217001 + ... + 200217006.

It is an arithmetic number, because the mean of its divisors is an integer number (400434008).

Almost surely, 2^1201302021 is an apocalyptic number.

It is an amenable number.

1201302021 is a deficient number, since it is larger than the sum of its proper divisors (400434011).

1201302021 is an equidigital number, since it uses as much as digits as its factorization.

1201302021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400434010.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1201302021 is about 34659.8041108140. The cubic root of 1201302021 is about 1063.0427646445.

Adding to 1201302021 its reverse (1202031021), we get a palindrome (2403333042).

Subtracting 1201302021 from its reverse (1202031021), we obtain a cube (729000 = 90³).

The spelling of 1201302021 in words is "one billion, two hundred one million, three hundred two thousand, twenty-one".