1221102101020 has 24 divisors (see below), whose sum is σ = 2607777370800. Its totient is φ = 480162181632.

The previous prime is 1221102100991. The next prime is 1221102101041. The reversal of 1221102101020 is 201012011221.

It is a super-2 number, since 2×1221102101020² (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 in 7 ways as a sum of consecutive naturals, for example, 517414965 + ... + 517417324.

It is an arithmetic number, because the mean of its divisors is an integer number (108657390450).

Almost surely, 2^{1221102101020} is an apocalyptic number.

1221102101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221102101020 is an abundant number, since it is smaller than the sum of its proper divisors (1386675269780).

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

1221102101020 is a wasteful number, since it uses less digits than its factorization.

1221102101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034832357 (or 1034832355 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221102101020 its reverse (201012011221), we get a palindrome (1422114112241).

The spelling of 1221102101020 in words is "one trillion, two hundred twenty-one billion, one hundred two million, one hundred one thousand, twenty".