101021011020 has 36 divisors (see below), whose sum is σ = 306430400640. Its totient is φ = 26938936224.

The previous prime is 101021010989. The next prime is 101021011027. The reversal of 101021011020 is 20110120101.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×101021011020² (a number of 23 digits) contains 22 as substring.

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 = 101021010993 and 101021011011.

It is not an unprimeable number, because it can be changed into a prime (101021011027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 280613740 + ... + 280614099.

Almost surely, 2^101021011020 is an apocalyptic number.

101021011020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101021011020 is an abundant number, since it is smaller than the sum of its proper divisors (205409389620).

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

101021011020 is a wasteful number, since it uses less digits than its factorization.

101021011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561227854 (or 561227849 counting only the distinct ones).

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

Adding to 101021011020 its reverse (20110120101), we get a palindrome (121131131121).

The spelling of 101021011020 in words is "one hundred one billion, twenty-one million, eleven thousand, twenty".