21100220051 has 2 divisors, whose sum is σ = 21100220052. Its totient is φ = 21100220050.

The previous prime is 21100220023. The next prime is 21100220069. The reversal of 21100220051 is 15002200112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100220051 - 2¹⁰ = 21100219027 is a prime.

It is not a weakly prime, because it can be changed into another prime (21100222051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550110025 + 10550110026.

It is an arithmetic number, because the mean of its divisors is an integer number (10550110026).

Almost surely, 2^21100220051 is an apocalyptic number.

21100220051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100220051 is an equidigital number, since it uses as much as digits as its factorization.

21100220051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 14.

Adding to 21100220051 its reverse (15002200112), we get a palindrome (36102420163).

The spelling of 21100220051 in words is "twenty-one billion, one hundred million, two hundred twenty thousand, fifty-one".