1021213001 has 6 divisors (see below), whose sum is σ = 1084818270. Its totient is φ = 961141376.

The previous prime is 1021212991. The next prime is 1021213031. The reversal of 1021213001 is 1003121201.

It can be written as a sum of positive squares in 3 ways, for example, as 106090000 + 915123001 = 10300^2 + 30251^2 .

It is not a de Polignac number, because 1021213001 - 2¹⁰ = 1021211977 is a prime.

It is a super-2 number, since 2×1021213001² = 2085751986822852002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021213031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1766516 + ... + 1767093.

It is an arithmetic number, because the mean of its divisors is an integer number (180803045).

Almost surely, 2^1021213001 is an apocalyptic number.

It is an amenable number.

1021213001 is a deficient number, since it is larger than the sum of its proper divisors (63605269).

1021213001 is an equidigital number, since it uses as much as digits as its factorization.

1021213001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3533643 (or 3533626 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1021213001 is about 31956.4234700944. The cubic root of 1021213001 is about 1007.0215823209.

Adding to 1021213001 its reverse (1003121201), we get a palindrome (2024334202).

The spelling of 1021213001 in words is "one billion, twenty-one million, two hundred thirteen thousand, one".