1001221101010 has 64 divisors (see below), whose sum is σ = 1979589235680. Its totient is φ = 362313768960.

The previous prime is 1001221100987. The next prime is 1001221101047. The reversal of 1001221101010 is 101011221001.

It can be written as a sum of positive squares in 16 ways, for example, as 182357183089 + 818863917921 = 427033^2 + 904911^2 .

It is a super-3 number, since 3×1001221101010³ (a number of 37 digits) contains 333 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 31 ways as a sum of consecutive naturals, for example, 6322600 + ... + 6479020.

Almost surely, 2^{1001221101010} is an apocalyptic number.

1001221101010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1001221101010 is a deficient number, since it is larger than the sum of its proper divisors (978368134670).

1001221101010 is a wasteful number, since it uses less digits than its factorization.

1001221101010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157423.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1001221101010 its reverse (101011221001), we get a palindrome (1102232322011).

The spelling of 1001221101010 in words is "one trillion, one billion, two hundred twenty-one million, one hundred one thousand, ten".