21202202057 has 2 divisors, whose sum is σ = 21202202058. Its totient is φ = 21202202056.

The previous prime is 21202202051. The next prime is 21202202107. The reversal of 21202202057 is 75020220212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21052849216 + 149352841 = 145096^2 + 12221^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202202057 - 2⁴ = 21202202041 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202202051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601101028 + 10601101029.

It is an arithmetic number, because the mean of its divisors is an integer number (10601101029).

Almost surely, 2^21202202057 is an apocalyptic number.

It is an amenable number.

21202202057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202202057 is an equidigital number, since it uses as much as digits as its factorization.

21202202057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 23.

Adding to 21202202057 its reverse (75020220212), we get a palindrome (96222422269).

It can be divided in two parts, 2120220205 and 7, that added together give a palindrome (2120220212).

The spelling of 21202202057 in words is "twenty-one billion, two hundred two million, two hundred two thousand, fifty-seven".