1221120020102 has 4 divisors (see below), whose sum is σ = 1831680030156. Its totient is φ = 610560010050.

The previous prime is 1221120020077. The next prime is 1221120020137. The reversal of 1221120020102 is 2010200211221.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1221120020102² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305280005024 + ... + 305280005027.

It is an arithmetic number, because the mean of its divisors is an integer number (457920007539).

Almost surely, 2^{1221120020102} is an apocalyptic number.

1221120020102 is a deficient number, since it is larger than the sum of its proper divisors (610560010054).

1221120020102 is an equidigital number, since it uses as much as digits as its factorization.

1221120020102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610560010053.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221120020102 its reverse (2010200211221), we get a palindrome (3231320231323).

The spelling of 1221120020102 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, twenty thousand, one hundred two".