102021101010 has 48 divisors (see below), whose sum is σ = 266944421016. Its totient is φ = 27032338944.

The previous prime is 102021101009. The next prime is 102021101047. The reversal of 102021101010 is 10101120201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 89573905521 + 12447195489 = 299289^2 + 111567^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 102021100983 and 102021101001.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3595959 + ... + 3624218.

Almost surely, 2^102021101010 is an apocalyptic number.

102021101010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

102021101010 is an abundant number, since it is smaller than the sum of its proper divisors (164923320006).

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

102021101010 is a wasteful number, since it uses less digits than its factorization.

102021101010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7220347 (or 7220344 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 102021101010 its reverse (10101120201), we get a palindrome (112122221211).

The spelling of 102021101010 in words is "one hundred two billion, twenty-one million, one hundred one thousand, ten".