1202021001 has 12 divisors (see below), whose sum is σ = 1792261120. Its totient is φ = 775497240.

The previous prime is 1202020969. The next prime is 1202021003. The reversal of 1202021001 is 1001202021.

It is not a de Polignac number, because 1202021001 - 2⁵ = 1202020969 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 not an unprimeable number, because it can be changed into a prime (1202021003) 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, 2153881 + ... + 2154438.

Almost surely, 2^1202021001 is an apocalyptic number.

It is an amenable number.

1202021001 is a deficient number, since it is larger than the sum of its proper divisors (590240119).

1202021001 is a wasteful number, since it uses less digits than its factorization.

1202021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4308356 (or 4308353 counting only the distinct ones).

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

The square root of 1202021001 is about 34670.1745164342. The cubic root of 1202021001 is about 1063.2547995991.

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

The spelling of 1202021001 in words is "one billion, two hundred two million, twenty-one thousand, one".