20100101023 has 4 divisors (see below), whose sum is σ = 20120802408. Its totient is φ = 20079399640.

The previous prime is 20100101003. The next prime is 20100101027. The reversal of 20100101023 is 32010100102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20100101023 is a prime.

It is a super-2 number, since 2×20100101023² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100101027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10349236 + ... + 10351177.

It is an arithmetic number, because the mean of its divisors is an integer number (5030200602).

Almost surely, 2^20100101023 is an apocalyptic number.

20100101023 is a deficient number, since it is larger than the sum of its proper divisors (20701385).

20100101023 is an equidigital number, since it uses as much as digits as its factorization.

20100101023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20701384.

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 20100101023 its reverse (32010100102), we get a palindrome (52110201125).

The spelling of 20100101023 in words is "twenty billion, one hundred million, one hundred one thousand, twenty-three".