102101221020 has 48 divisors (see below), whose sum is σ = 293610004128. Its totient is φ = 26491127040.

The previous prime is 102101220989. The next prime is 102101221031. The reversal of 102101221020 is 20122101201.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 102101220987 and 102101221005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22993551 + ... + 22997990.

It is an arithmetic number, because the mean of its divisors is an integer number (6116875086).

Almost surely, 2^102101221020 is an apocalyptic number.

102101221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102101221020 is an abundant number, since it is smaller than the sum of its proper divisors (191508783108).

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

102101221020 is a wasteful number, since it uses less digits than its factorization.

102101221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45991590 (or 45991588 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 102101221020 its reverse (20122101201), we get a palindrome (122223322221).

The spelling of 102101221020 in words is "one hundred two billion, one hundred one million, two hundred twenty-one thousand, twenty".