21000220221007 has 2 divisors, whose sum is σ = 21000220221008. Its totient is φ = 21000220221006.

The previous prime is 21000220220929. The next prime is 21000220221031. The reversal of 21000220221007 is 70012202200012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000220221007 - 2²³ = 21000211832399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000220221037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500110110503 + 10500110110504.

It is an arithmetic number, because the mean of its divisors is an integer number (10500110110504).

Almost surely, 2^{21000220221007} is an apocalyptic number.

21000220221007 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000220221007 is an equidigital number, since it uses as much as digits as its factorization.

21000220221007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 19.

Adding to 21000220221007 its reverse (70012202200012), we get a palindrome (91012422421019).

The spelling of 21000220221007 in words is "twenty-one trillion, two hundred twenty million, two hundred twenty-one thousand, seven".