1021020012 has 24 divisors (see below), whose sum is σ = 2647089200. Its totient is φ = 340339968.

The previous prime is 1021019977. The next prime is 1021020019. The reversal of 1021020012 is 2100201201.

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

It is a junction number, because it is equal to n+sod(n) for n = 1021019976 and 1021020003.

It is not an unprimeable number, because it can be changed into a prime (1021020019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4726837 + ... + 4727052.

Almost surely, 2^1021020012 is an apocalyptic number.

1021020012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1021020012 is an abundant number, since it is smaller than the sum of its proper divisors (1626069188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021020012 is a wasteful number, since it uses less digits than its factorization.

1021020012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9453902 (or 9453894 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1021020012 is about 31953.4037623537. The cubic root of 1021020012 is about 1006.9581426233.

Adding to 1021020012 its reverse (2100201201), we get a palindrome (3121221213).

The spelling of 1021020012 in words is "one billion, twenty-one million, twenty thousand, twelve".