1001210020 has 12 divisors (see below), whose sum is σ = 2102541084. Its totient is φ = 400484000.

The previous prime is 1001210003. The next prime is 1001210029. The reversal of 1001210020 is 200121001.

It can be written as a sum of positive squares in 2 ways, for example, as 727704576 + 273505444 = 26976^2 + 16538^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1001209985 and 1001210012.

It is not an unprimeable number, because it can be changed into a prime (1001210029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25030231 + ... + 25030270.

It is an arithmetic number, because the mean of its divisors is an integer number (175211757).

Almost surely, 2^1001210020 is an apocalyptic number.

1001210020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001210020 is an abundant number, since it is smaller than the sum of its proper divisors (1101331064).

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

1001210020 is a wasteful number, since it uses less digits than its factorization.

1001210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50060510 (or 50060508 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1001210020 is about 31641.9029136997. The cubic root of 1001210020 is about 1000.4031774261.

Adding to 1001210020 its reverse (200121001), we get a palindrome (1201331021).

The spelling of 1001210020 in words is "one billion, one million, two hundred ten thousand, twenty".