1000101220 has 24 divisors (see below), whose sum is σ = 2103204600. Its totient is φ = 399470592.

The previous prime is 1000101197. The next prime is 1000101239. The reversal of 1000101220 is 221010001.

It can be written as a sum of positive squares in 4 ways, for example, as 20286016 + 979815204 = 4504^2 + 31302^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21085 + ... + 49444.

It is an arithmetic number, because the mean of its divisors is an integer number (87633525).

Almost surely, 2^1000101220 is an apocalyptic number.

1000101220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000101220 is an abundant number, since it is smaller than the sum of its proper divisors (1103103380).

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

1000101220 is a wasteful number, since it uses less digits than its factorization.

1000101220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71247 (or 71245 counting only the distinct ones).

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

The square root of 1000101220 is about 31624.3769899108. The cubic root of 1000101220 is about 1000.0337388617.

Adding to 1000101220 its reverse (221010001), we get a palindrome (1221111221).

The spelling of 1000101220 in words is "one billion, one hundred one thousand, two hundred twenty".