1001221210 has 32 divisors (see below), whose sum is σ = 1981070784. Its totient is φ = 361296000.

The previous prime is 1001221187. The next prime is 1001221223. The reversal of 1001221210 is 121221001.

It is a super-2 number, since 2×1001221210² = 2004887822707728200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20331 + ... + 49150.

It is an arithmetic number, because the mean of its divisors is an integer number (61908462).

Almost surely, 2^1001221210 is an apocalyptic number.

1001221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1001221210 is a deficient number, since it is larger than the sum of its proper divisors (979849574).

1001221210 is a wasteful number, since it uses less digits than its factorization.

1001221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69630.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1001221210 is about 31642.0797356937. The cubic root of 1001221210 is about 1000.4069044063.

Adding to 1001221210 its reverse (121221001), we get a palindrome (1122442211).

The spelling of 1001221210 in words is "one billion, one million, two hundred twenty-one thousand, two hundred ten".