1221010100102 has 16 divisors (see below), whose sum is σ = 1973995486512. Its totient is φ = 563087535840.

The previous prime is 1221010100083. The next prime is 1221010100143. The reversal of 1221010100102 is 2010010101221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18950024 + ... + 19014347.

It is an arithmetic number, because the mean of its divisors is an integer number (123374717907).

Almost surely, 2^{1221010100102} is an apocalyptic number.

1221010100102 is a deficient number, since it is larger than the sum of its proper divisors (752985386410).

1221010100102 is a wasteful number, since it uses less digits than its factorization.

1221010100102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37965623.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1221010100102 its reverse (2010010101221), we get a palindrome (3231020201323).

The spelling of 1221010100102 in words is "one trillion, two hundred twenty-one billion, ten million, one hundred thousand, one hundred two".