21202210002251 has 2 divisors, whose sum is σ = 21202210002252. Its totient is φ = 21202210002250.

The previous prime is 21202210002221. The next prime is 21202210002263. The reversal of 21202210002251 is 15220001220212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202210002251 - 2⁶ = 21202210002187 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202210002221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601105001125 + 10601105001126.

It is an arithmetic number, because the mean of its divisors is an integer number (10601105001126).

Almost surely, 2^{21202210002251} is an apocalyptic number.

21202210002251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202210002251 is an equidigital number, since it uses as much as digits as its factorization.

21202210002251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 21202210002251 its reverse (15220001220212), we get a palindrome (36422211222463).

The spelling of 21202210002251 in words is "twenty-one trillion, two hundred two billion, two hundred ten million, two thousand, two hundred fifty-one".