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21020020022251 is a prime number
BaseRepresentation
bin1001100011110000110101…
…10100111001101111101011
32202102111100100002102202101
410301320122310321233223
510223343000111203001
6112412244111114231
74266434456115505
oct461703264715753
982374310072671
1021020020022251
1167745a4347a68
1224359a2212977
13b96244147793
145295354bcd75
15266ba3ec0a01
hex131e1ad39beb

21020020022251 has 2 divisors, whose sum is σ = 21020020022252. Its totient is φ = 21020020022250.

The previous prime is 21020020022171. The next prime is 21020020022317. The reversal of 21020020022251 is 15222002002012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21020020022251 - 217 = 21020019891179 is a prime.

It is not a weakly prime, because it can be changed into another prime (21020020026251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510010011125 + 10510010011126.

It is an arithmetic number, because the mean of its divisors is an integer number (10510010011126).

Almost surely, 221020020022251 is an apocalyptic number.

21020020022251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020020022251 is an equidigital number, since it uses as much as digits as its factorization.

21020020022251 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 19.

Adding to 21020020022251 its reverse (15222002002012), we get a palindrome (36242022024263).

The spelling of 21020020022251 in words is "twenty-one trillion, twenty billion, twenty million, twenty-two thousand, two hundred fifty-one".