102021002020 has 48 divisors (see below), whose sum is σ = 255496082688. Its totient is φ = 33457818240.

The previous prime is 102021002009. The next prime is 102021002047. The reversal of 102021002020 is 20200120201.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 102021001988 and 102021002006.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15838551 + ... + 15844990.

It is an arithmetic number, because the mean of its divisors is an integer number (5322835056).

Almost surely, 2^102021002020 is an apocalyptic number.

102021002020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102021002020 is an abundant number, since it is smaller than the sum of its proper divisors (153475080668).

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

102021002020 is a wasteful number, since it uses less digits than its factorization.

102021002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31683580 (or 31683578 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 102021002020 its reverse (20200120201), we get a palindrome (122221122221).

The spelling of 102021002020 in words is "one hundred two billion, twenty-one million, two thousand, twenty".