121221210220102 has 8 divisors (see below), whose sum is σ = 189737546431536. Its totient is φ = 57975361409592.

The previous prime is 121221210220039. The next prime is 121221210220129. The reversal of 121221210220102 is 201022012122121.

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

It is a self number, because there is not a number n which added to its sum of digits gives 121221210220102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1317621850173 + ... + 1317621850264.

It is an arithmetic number, because the mean of its divisors is an integer number (23717193303942).

Almost surely, 2^{121221210220102} is an apocalyptic number.

121221210220102 is a deficient number, since it is larger than the sum of its proper divisors (68516336211434).

121221210220102 is a wasteful number, since it uses less digits than its factorization.

121221210220102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2635243700462.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121221210220102 its reverse (201022012122121), we get a palindrome (322243222342223).

The spelling of 121221210220102 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred ten million, two hundred twenty thousand, one hundred two".