21221111012101 has 32 divisors (see below), whose sum is σ = 28601018062848. Its totient is φ = 15205898024640.

The previous prime is 21221111012093. The next prime is 21221111012111. The reversal of 21221111012101 is 10121011112212.

It is a cyclic number.

It is not a de Polignac number, because 21221111012101 - 2³ = 21221111012093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221111012111) 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, 40040751 + ... + 40567276.

It is an arithmetic number, because the mean of its divisors is an integer number (893781814464).

Almost surely, 2^{21221111012101} is an apocalyptic number.

It is an amenable number.

21221111012101 is a deficient number, since it is larger than the sum of its proper divisors (7379907050747).

21221111012101 is a wasteful number, since it uses less digits than its factorization.

21221111012101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80608321.

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

Adding to 21221111012101 its reverse (10121011112212), we get a palindrome (31342122124313).

The spelling of 21221111012101 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, twelve thousand, one hundred one".