1021000002 has 32 divisors (see below), whose sum is σ = 2260894464. Its totient is φ = 304774800.

The previous prime is 1020999989. The next prime is 1021000007. The reversal of 1021000002 is 2000001201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is not an unprimeable number, because it can be changed into a prime (1021000007) 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, 111024 + ... + 119867.

It is an arithmetic number, because the mean of its divisors is an integer number (70652952).

Almost surely, 2^1021000002 is an apocalyptic number.

1021000002 is an abundant number, since it is smaller than the sum of its proper divisors (1239894462).

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

1021000002 is a wasteful number, since it uses less digits than its factorization.

1021000002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230974.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 1021000002 is about 31953.0906486368. The cubic root of 1021000002 is about 1006.9515644421.

Adding to 1021000002 its reverse (2000001201), we get a palindrome (3021001203).

It can be divided in two parts, 10 and 21000002, that added together give a palindrome (21000012).

The spelling of 1021000002 in words is "one billion, twenty-one million, two", and thus it is an aban number and an uban number.