1021021010 has 16 divisors (see below), whose sum is σ = 1850175000. Its totient is φ = 405666816.

The previous prime is 1021021007. The next prime is 1021021013. The reversal of 1021021010 is 101201201.

It is an interprime number because it is at equal distance from previous prime (1021021007) and next prime (1021021013).

It can be written as a sum of positive squares in 4 ways, for example, as 886669729 + 134351281 = 29777^2 + 11591^2 .

It is a super-2 number, since 2×1021021010² = 2084967805722840200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1021021013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341135 + ... + 344114.

Almost surely, 2^1021021010 is an apocalyptic number.

1021021010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021021010 is a deficient number, since it is larger than the sum of its proper divisors (829153990).

1021021010 is a wasteful number, since it uses less digits than its factorization.

1021021010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685405.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1021021010 is about 31953.4193788396. The cubic root of 1021021010 is about 1006.9584707083.

Adding to 1021021010 its reverse (101201201), we get a palindrome (1122222211).

The spelling of 1021021010 in words is "one billion, twenty-one million, twenty-one thousand, ten".