1221111020101 has 8 divisors (see below), whose sum is σ = 1395572533760. Its totient is φ = 1046653777008.

The previous prime is 1221111020093. The next prime is 1221111020137. The reversal of 1221111020101 is 1010201111221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221111020101 - 2³ = 1221111020093 is a prime.

It is a super-2 number, since 2×1221111020101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221111029101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429486 + ... + 1620703.

It is an arithmetic number, because the mean of its divisors is an integer number (174446566720).

Almost surely, 2^{1221111020101} is an apocalyptic number.

It is an amenable number.

1221111020101 is a deficient number, since it is larger than the sum of its proper divisors (174461513659).

1221111020101 is an equidigital number, since it uses as much as digits as its factorization.

1221111020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135283.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1221111020101 its reverse (1010201111221), we get a palindrome (2231312131322).

The spelling of 1221111020101 in words is "one trillion, two hundred twenty-one billion, one hundred eleven million, twenty thousand, one hundred one".