101021100021 has 16 divisors (see below), whose sum is σ = 151464035520. Its totient is φ = 66535984080.

The previous prime is 101021100013. The next prime is 101021100079. The reversal of 101021100021 is 120001120101.

It is a happy number.

It is not a de Polignac number, because 101021100021 - 2³ = 101021100013 is a prime.

It is a super-3 number, since 3×101021100021³ (a number of 34 digits) contains 333 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 = 101021099976 and 101021100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101021100821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22537050 + ... + 22541531.

It is an arithmetic number, because the mean of its divisors is an integer number (9466502220).

Almost surely, 2^101021100021 is an apocalyptic number.

It is an amenable number.

101021100021 is a deficient number, since it is larger than the sum of its proper divisors (50442935499).

101021100021 is an equidigital number, since it uses as much as digits as its factorization.

101021100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45078673 (or 45078667 counting only the distinct ones).

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

Adding to 101021100021 its reverse (120001120101), we get a palindrome (221022220122).

The spelling of 101021100021 in words is "one hundred one billion, twenty-one million, one hundred thousand, twenty-one".