1001222100021 has 32 divisors (see below), whose sum is σ = 1568441774592. Its totient is φ = 560090727360.

The previous prime is 1001222099993. The next prime is 1001222100037. The reversal of 1001222100021 is 1200012221001.

It is not a de Polignac number, because 1001222100021 - 2⁹ = 1001222099509 is a prime.

It is a super-2 number, since 2×1001222100021² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001222800021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8263746 + ... + 8384028.

It is an arithmetic number, because the mean of its divisors is an integer number (49013805456).

Almost surely, 2^{1001222100021} is an apocalyptic number.

1001222100021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1001222100021 is a deficient number, since it is larger than the sum of its proper divisors (567219674571).

1001222100021 is a wasteful number, since it uses less digits than its factorization.

1001222100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139713.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1001222100021 its reverse (1200012221001), we get a palindrome (2201234321022).

The spelling of 1001222100021 in words is "one trillion, one billion, two hundred twenty-two million, one hundred thousand, twenty-one".