1001021312 has 16 divisors (see below), whose sum is σ = 1994222400. Its totient is φ = 500510592.

The previous prime is 1001021311. The next prime is 1001021321. The reversal of 1001021312 is 2131201001.

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 1001021293 and 1001021302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001021311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3910112 + ... + 3910367.

It is an arithmetic number, because the mean of its divisors is an integer number (124638900).

Almost surely, 2^1001021312 is an apocalyptic number.

It is an amenable number.

1001021312 is a deficient number, since it is larger than the sum of its proper divisors (993201088).

1001021312 is an frugal number, since it uses more digits than its factorization.

1001021312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7820493 (or 7820481 counting only the distinct ones).

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

The square root of 1001021312 is about 31638.9208412676. The cubic root of 1001021312 is about 1000.3403215015.

Adding to 1001021312 its reverse (2131201001), we get a palindrome (3132222313).

The spelling of 1001021312 in words is "one billion, one million, twenty-one thousand, three hundred twelve".