101021110020 has 72 divisors (see below), whose sum is σ = 313557019776. Its totient is φ = 26312473152.

The previous prime is 101021110009. The next prime is 101021110039. The reversal of 101021110020 is 20011120101.

It is a happy number.

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 = 101021109984 and 101021110011.

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, 6518172 + ... + 6533651.

It is an arithmetic number, because the mean of its divisors is an integer number (4354958608).

Almost surely, 2^101021110020 is an apocalyptic number.

101021110020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101021110020 is an abundant number, since it is smaller than the sum of its proper divisors (212535909756).

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

101021110020 is a wasteful number, since it uses less digits than its factorization.

101021110020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13051881 (or 13051876 counting only the distinct ones).

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

Adding to 101021110020 its reverse (20011120101), we get a palindrome (121032230121).

The spelling of 101021110020 in words is "one hundred one billion, twenty-one million, one hundred ten thousand, twenty".