10102021020 has 144 divisors (see below), whose sum is σ = 37714272960. Its totient is φ = 2131411968.

The previous prime is 10102021009. The next prime is 10102021043. The reversal of 10102021020 is 2012020101.

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 = 10102020993 and 10102021011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 291985 + ... + 324744.

Almost surely, 2^10102021020 is an apocalyptic number.

10102021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10102021020 is an abundant number, since it is smaller than the sum of its proper divisors (27612251940).

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

10102021020 is a wasteful number, since it uses less digits than its factorization.

10102021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616764 (or 616759 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 10102021020 its reverse (2012020101), we get a palindrome (12114041121).

The spelling of 10102021020 in words is "ten billion, one hundred two million, twenty-one thousand, twenty".