1221012111102 has 16 divisors (see below), whose sum is σ = 2790884825472. Its totient is φ = 348860603160.

The previous prime is 1221012111101. The next prime is 1221012111203. The reversal of 1221012111102 is 2011112101221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221012111101) 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, 14535858424 + ... + 14535858507.

It is an arithmetic number, because the mean of its divisors is an integer number (174430301592).

Almost surely, 2^{1221012111102} is an apocalyptic number.

1221012111102 is an abundant number, since it is smaller than the sum of its proper divisors (1569872714370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221012111102 is a wasteful number, since it uses less digits than its factorization.

1221012111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29071716943.

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

Adding to 1221012111102 its reverse (2011112101221), we get a palindrome (3232124212323).

The spelling of 1221012111102 in words is "one trillion, two hundred twenty-one billion, twelve million, one hundred eleven thousand, one hundred two".