102121201020 has 96 divisors (see below), whose sum is σ = 294785745408. Its totient is φ = 26395414272.

The previous prime is 102121201019. The next prime is 102121201081. The reversal of 102121201020 is 20102121201.

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 = 102121200987 and 102121201005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 496407 + ... + 671313.

It is an arithmetic number, because the mean of its divisors is an integer number (3070684848).

Almost surely, 2^102121201020 is an apocalyptic number.

102121201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 102121201020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147392872704).

102121201020 is an abundant number, since it is smaller than the sum of its proper divisors (192664544388).

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

102121201020 is a wasteful number, since it uses less digits than its factorization.

102121201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175219 (or 175217 counting only the distinct ones).

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

Adding to 102121201020 its reverse (20102121201), we get a palindrome (122223322221).

The spelling of 102121201020 in words is "one hundred two billion, one hundred twenty-one million, two hundred one thousand, twenty".