20211101001 has 144 divisors (see below), whose sum is σ = 37869581568. Its totient is φ = 10287648000.

The previous prime is 20211100997. The next prime is 20211101017. The reversal of 20211101001 is 10010111202.

It is a happy number.

It is not a de Polignac number, because 20211101001 - 2² = 20211100997 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (20211101081) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 32029956 + ... + 32030586.

Almost surely, 2^20211101001 is an apocalyptic number.

20211101001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20211101001 is a deficient number, since it is larger than the sum of its proper divisors (17658480567).

20211101001 is a wasteful number, since it uses less digits than its factorization.

20211101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852 (or 842 counting only the distinct ones).

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

Adding to 20211101001 its reverse (10010111202), we get a palindrome (30221212203).

The spelling of 20211101001 in words is "twenty billion, two hundred eleven million, one hundred one thousand, one".