20977110001 has 4 divisors (see below), whose sum is σ = 20977414132. Its totient is φ = 20976805872.

The previous prime is 20977109969. The next prime is 20977110023. The reversal of 20977110001 is 10001177902.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7608200625 + 13368909376 = 87225^2 + 115624^2 .

It is a cyclic number.

It is not a de Polignac number, because 20977110001 - 2⁵ = 20977109969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20977110901) 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, 6535 + ... + 204931.

It is an arithmetic number, because the mean of its divisors is an integer number (5244353533).

Almost surely, 2^20977110001 is an apocalyptic number.

It is an amenable number.

20977110001 is a deficient number, since it is larger than the sum of its proper divisors (304131).

20977110001 is a wasteful number, since it uses less digits than its factorization.

20977110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304130.

The product of its (nonzero) digits is 882, while the sum is 28.

Adding to 20977110001 its reverse (10001177902), we get a palindrome (30978287903).

The spelling of 20977110001 in words is "twenty billion, nine hundred seventy-seven million, one hundred ten thousand, one".