20221221049 has 2 divisors, whose sum is σ = 20221221050. Its totient is φ = 20221221048.

The previous prime is 20221220989. The next prime is 20221221061. The reversal of 20221221049 is 94012212202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16297075600 + 3924145449 = 127660^2 + 62643^2 .

It is a cyclic number.

It is not a de Polignac number, because 20221221049 - 2¹³ = 20221212857 is a prime.

It is not a weakly prime, because it can be changed into another prime (20221221749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110610524 + 10110610525.

It is an arithmetic number, because the mean of its divisors is an integer number (10110610525).

Almost surely, 2^20221221049 is an apocalyptic number.

It is an amenable number.

20221221049 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221221049 is an equidigital number, since it uses as much as digits as its factorization.

20221221049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The spelling of 20221221049 in words is "twenty billion, two hundred twenty-one million, two hundred twenty-one thousand, forty-nine".