102100102021020 has 24 divisors (see below), whose sum is σ = 285880285659024. Its totient is φ = 27226693872256.

The previous prime is 102100102020991. The next prime is 102100102021033. The reversal of 102100102021020 is 20120201001201.

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 = 102100102020987 and 102100102021005.

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, 850834183449 + ... + 850834183568.

It is an arithmetic number, because the mean of its divisors is an integer number (11911678569126).

Almost surely, 2^{102100102021020} is an apocalyptic number.

102100102021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102100102021020 is an abundant number, since it is smaller than the sum of its proper divisors (183780183638004).

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

102100102021020 is a wasteful number, since it uses less digits than its factorization.

102100102021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701668367029 (or 1701668367027 counting only the distinct ones).

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

Adding to 102100102021020 its reverse (20120201001201), we get a palindrome (122220303022221).

The spelling of 102100102021020 in words is "one hundred two trillion, one hundred billion, one hundred two million, twenty-one thousand, twenty".