21220021220029 has 2 divisors, whose sum is σ = 21220021220030. Its totient is φ = 21220021220028.

The previous prime is 21220021220023. The next prime is 21220021220113. The reversal of 21220021220029 is 92002212002212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14813184464100 + 6406836755929 = 3848790^2 + 2531173^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220021220029 - 2³³ = 21211431285437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21220021219985 and 21220021220012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21220021220023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610010610014 + 10610010610015.

It is an arithmetic number, because the mean of its divisors is an integer number (10610010610015).

Almost surely, 2^{21220021220029} is an apocalyptic number.

It is an amenable number.

21220021220029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220021220029 is an equidigital number, since it uses as much as digits as its factorization.

21220021220029 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 21220021220029 in words is "twenty-one trillion, two hundred twenty billion, twenty-one million, two hundred twenty thousand, twenty-nine".