1001202021 has 12 divisors (see below), whose sum is σ = 1448480800. Its totient is φ = 666406440.

The previous prime is 1001202019. The next prime is 1001202023. The reversal of 1001202021 is 1202021001.

It is an interprime number because it is at equal distance from previous prime (1001202019) and next prime (1001202023).

It is not a de Polignac number, because 1001202021 - 2¹ = 1001202019 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001201994 and 1001202012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001202023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82471 + ... + 93828.

Almost surely, 2^1001202021 is an apocalyptic number.

It is an amenable number.

1001202021 is a deficient number, since it is larger than the sum of its proper divisors (447278779).

1001202021 is a wasteful number, since it uses less digits than its factorization.

1001202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176936 (or 176933 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1001202021 is about 31641.7765146017. The cubic root of 1001202021 is about 1000.4005132344.

Adding to 1001202021 its reverse (1202021001), we get a palindrome (2203223022).

The spelling of 1001202021 in words is "one billion, one million, two hundred two thousand, twenty-one".