101020110021 has 96 divisors (see below), whose sum is σ = 160870634496. Its totient is φ = 60834816000.

The previous prime is 101020110019. The next prime is 101020110029. The reversal of 101020110021 is 120011020101.

It is a happy number.

It is not a de Polignac number, because 101020110021 - 2¹ = 101020110019 is a prime.

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 = 101020109985 and 101020110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101020110029) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 123044791 + ... + 123045611.

It is an arithmetic number, because the mean of its divisors is an integer number (1675735776).

Almost surely, 2^101020110021 is an apocalyptic number.

It is an amenable number.

101020110021 is a deficient number, since it is larger than the sum of its proper divisors (59850524475).

101020110021 is a wasteful number, since it uses less digits than its factorization.

101020110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203 (or 1200 counting only the distinct ones).

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

Adding to 101020110021 its reverse (120011020101), we get a palindrome (221031130122).

The spelling of 101020110021 in words is "one hundred one billion, twenty million, one hundred ten thousand, twenty-one".