21201101222051 has 2 divisors, whose sum is σ = 21201101222052. Its totient is φ = 21201101222050.

The previous prime is 21201101222039. The next prime is 21201101222069. The reversal of 21201101222051 is 15022210110212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21201101222051 - 2¹⁴ = 21201101205667 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21201101228051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600550611025 + 10600550611026.

It is an arithmetic number, because the mean of its divisors is an integer number (10600550611026).

Almost surely, 2^{21201101222051} is an apocalyptic number.

21201101222051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201101222051 is an equidigital number, since it uses as much as digits as its factorization.

21201101222051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 20.

Adding to 21201101222051 its reverse (15022210110212), we get a palindrome (36223311332263).

The spelling of 21201101222051 in words is "twenty-one trillion, two hundred one billion, one hundred one million, two hundred twenty-two thousand, fifty-one".