1012010121 has 12 divisors (see below), whose sum is σ = 1464955648. Its totient is φ = 673213464.

The previous prime is 1012010101. The next prime is 1012010149. The reversal of 1012010121 is 1210102101.

It is a happy number.

It is not a de Polignac number, because 1012010121 - 2⁵ = 1012010089 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 (1012010101) 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, 117265 + ... + 125598.

Almost surely, 2^1012010121 is an apocalyptic number.

It is an amenable number.

1012010121 is a deficient number, since it is larger than the sum of its proper divisors (452945527).

1012010121 is a wasteful number, since it uses less digits than its factorization.

1012010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243332 (or 243329 counting only the distinct ones).

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

The square root of 1012010121 is about 31812.1065162306. The cubic root of 1012010121 is about 1003.9874527540.

Adding to 1012010121 its reverse (1210102101), we get a palindrome (2222112222).

The spelling of 1012010121 in words is "one billion, twelve million, ten thousand, one hundred twenty-one".