21122221101 has 16 divisors (see below), whose sum is σ = 29078100480. Its totient is φ = 13624119360.

The previous prime is 21122221037. The next prime is 21122221121. The reversal of 21122221101 is 10112222112.

It is not a de Polignac number, because 21122221101 - 2⁶ = 21122221037 is a prime.

It is a super-2 number, since 2×21122221101² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122221121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 424015 + ... + 471203.

It is an arithmetic number, because the mean of its divisors is an integer number (1817381280).

Almost surely, 2^21122221101 is an apocalyptic number.

It is an amenable number.

21122221101 is a deficient number, since it is larger than the sum of its proper divisors (7955879379).

21122221101 is a wasteful number, since it uses less digits than its factorization.

21122221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52036.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21122221101 its reverse (10112222112), we get a palindrome (31234443213).

The spelling of 21122221101 in words is "twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred one".