1012121001 has 14 divisors (see below), whose sum is σ = 1517488410. Its totient is φ = 674746848.

The previous prime is 1012120979. The next prime is 1012121009. The reversal of 1012121001 is 1001212101.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1006475625 + 5645376 = 31725^2 + 2376^2 .

It is not a de Polignac number, because 1012121001 - 2⁵ = 1012120969 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1012121009) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 693456 + ... + 694913.

Almost surely, 2^1012121001 is an apocalyptic number.

It is an amenable number.

1012121001 is a deficient number, since it is larger than the sum of its proper divisors (505367409).

1012121001 is an frugal number, since it uses more digits than its factorization.

1012121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388387 (or 1388372 counting only the distinct ones).

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

The square root of 1012121001 is about 31813.8492012520. The cubic root of 1012121001 is about 1004.0241184161.

Adding to 1012121001 its reverse (1001212101), we get a palindrome (2013333102).

It can be divided in two parts, 101212100 and 1, that added together give a palindrome (101212101).

The spelling of 1012121001 in words is "one billion, twelve million, one hundred twenty-one thousand, one".