21220048237 has 2 divisors, whose sum is σ = 21220048238. Its totient is φ = 21220048236.

The previous prime is 21220048177. The next prime is 21220048243. The reversal of 21220048237 is 73284002212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14010509956 + 7209538281 = 118366^2 + 84909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220048237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21220048199 and 21220048208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220048277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610024118 + 10610024119.

It is an arithmetic number, because the mean of its divisors is an integer number (10610024119).

Almost surely, 2^21220048237 is an apocalyptic number.

It is an amenable number.

21220048237 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220048237 is an equidigital number, since it uses as much as digits as its factorization.

21220048237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 31.

The spelling of 21220048237 in words is "twenty-one billion, two hundred twenty million, forty-eight thousand, two hundred thirty-seven".