101011110021 has 10 divisors (see below), whose sum is σ = 150893139782. Its totient is φ = 67340739960.

The previous prime is 101011110007. The next prime is 101011110029. The reversal of 101011110021 is 120011110101.

It can be written as a sum of positive squares in only one way, i.e., 65446430625 + 35564679396 = 255825^2 + 188586^2 .

It is not a de Polignac number, because 101011110021 - 2⁶ = 101011109957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101011109985 and 101011110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101011110029) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 623525290 + ... + 623525451.

Almost surely, 2^101011110021 is an apocalyptic number.

It is an amenable number.

101011110021 is a deficient number, since it is larger than the sum of its proper divisors (49882029761).

101011110021 is an equidigital number, since it uses as much as digits as its factorization.

101011110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247050753 (or 1247050744 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 101011110021 its reverse (120011110101), we get a palindrome (221022220122).

The spelling of 101011110021 in words is "one hundred one billion, eleven million, one hundred ten thousand, twenty-one".