1012012021 has 16 divisors (see below), whose sum is σ = 1044294768. Its totient is φ = 980352000.

The previous prime is 1012012003. The next prime is 1012012031. The reversal of 1012012021 is 1202102101.

It can be written as a sum of positive squares in 8 ways, for example, as 16924996 + 995087025 = 4114^2 + 31545^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012012021 - 2⁹ = 1012011509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012011989 and 1012012007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012012031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1706301 + ... + 1706893.

It is an arithmetic number, because the mean of its divisors is an integer number (65268423).

Almost surely, 2^1012012021 is an apocalyptic number.

It is an amenable number.

1012012021 is a deficient number, since it is larger than the sum of its proper divisors (32282747).

1012012021 is a wasteful number, since it uses less digits than its factorization.

1012012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1012012021 is about 31812.1363790614. The cubic root of 1012012021 is about 1003.9880810662.

Adding to 1012012021 its reverse (1202102101), we get a palindrome (2214114122).

The spelling of 1012012021 in words is "one billion, twelve million, twelve thousand, twenty-one".