1021112001 has 96 divisors (see below), whose sum is σ = 1915932928. Its totient is φ = 529079040.

The previous prime is 1021111951. The next prime is 1021112017. The reversal of 1021112001 is 1002111201.

It is a happy number.

It is not a de Polignac number, because 1021112001 - 2⁶ = 1021111937 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1021113001) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1348515 + ... + 1349271.

Almost surely, 2^1021112001 is an apocalyptic number.

It is an amenable number.

1021112001 is a deficient number, since it is larger than the sum of its proper divisors (894820927).

1021112001 is an equidigital number, since it uses as much as digits as its factorization.

1021112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853 (or 841 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1021112001 is about 31954.8431540510. The cubic root of 1021112001 is about 1006.9883824129.

Adding to 1021112001 its reverse (1002111201), we get a palindrome (2023223202).

It can be divided in two parts, 102111200 and 1, that added together give a palindrome (102111201).

The spelling of 1021112001 in words is "one billion, twenty-one million, one hundred twelve thousand, one".