102021220100 has 72 divisors (see below), whose sum is σ = 240555436800. Its totient is φ = 37413532800.

The previous prime is 102021220087. The next prime is 102021220109. The reversal of 102021220100 is 1022120201.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (102021220109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 807155 + ... + 924954.

Almost surely, 2^102021220100 is an apocalyptic number.

102021220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102021220100 is an abundant number, since it is smaller than the sum of its proper divisors (138534216700).

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

102021220100 is a wasteful number, since it uses less digits than its factorization.

102021220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1732173 (or 1732166 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 102021220100 its reverse (1022120201), we get a palindrome (103043340301).

The spelling of 102021220100 in words is "one hundred two billion, twenty-one million, two hundred twenty thousand, one hundred".