1221211102101 has 16 divisors (see below), whose sum is σ = 1649276563584. Its totient is φ = 803693058624.

The previous prime is 1221211102081. The next prime is 1221211102121. The reversal of 1221211102101 is 1012011121221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1221211102081) and next prime (1221211102121).

It is a de Polignac number, because none of the positive numbers 2^k-1221211102101 is a prime.

It is a super-2 number, since 2×1221211102101² (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 (1221211102121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6135706 + ... + 6331611.

It is an arithmetic number, because the mean of its divisors is an integer number (103079785224).

Almost surely, 2^{1221211102101} is an apocalyptic number.

It is an amenable number.

1221211102101 is a deficient number, since it is larger than the sum of its proper divisors (428065461483).

1221211102101 is a wasteful number, since it uses less digits than its factorization.

1221211102101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12467740.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221211102101 its reverse (1012011121221), we get a palindrome (2233222223322).

The spelling of 1221211102101 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, one hundred two thousand, one hundred one".