1221102201020 has 48 divisors (see below), whose sum is σ = 2764379499840. Its totient is φ = 450409744896.

The previous prime is 1221102201017. The next prime is 1221102201023. The reversal of 1221102201020 is 201022011221.

It is an interprime number because it is at equal distance from previous prime (1221102201017) and next prime (1221102201023).

It is a junction number, because it is equal to n+sod(n) for n = 1221102200986 and 1221102201004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221102201023) 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, 2133305 + ... + 2644464.

It is an arithmetic number, because the mean of its divisors is an integer number (57591239580).

Almost surely, 2^{1221102201020} is an apocalyptic number.

1221102201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221102201020 is an abundant number, since it is smaller than the sum of its proper divisors (1543277298820).

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

1221102201020 is a wasteful number, since it uses less digits than its factorization.

1221102201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778774 (or 4778772 counting only the distinct ones).

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

Adding to 1221102201020 its reverse (201022011221), we get a palindrome (1422124212241).

The spelling of 1221102201020 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred one thousand, twenty".