21020219979029 has 2 divisors, whose sum is σ = 21020219979030. Its totient is φ = 21020219979028.

The previous prime is 21020219979013. The next prime is 21020219979053. The reversal of 21020219979029 is 92097991202012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12405906928804 + 8614313050225 = 3522202^2 + 2935015^2 .

It is a cyclic number.

It is not a de Polignac number, because 21020219979029 - 2⁴ = 21020219979013 is a prime.

It is a super-3 number, since 3×21020219979029³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21020219972029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510109989514 + 10510109989515.

It is an arithmetic number, because the mean of its divisors is an integer number (10510109989515).

Almost surely, 2^{21020219979029} is an apocalyptic number.

It is an amenable number.

21020219979029 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020219979029 is an equidigital number, since it uses as much as digits as its factorization.

21020219979029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 53.

The spelling of 21020219979029 in words is "twenty-one trillion, twenty billion, two hundred nineteen million, nine hundred seventy-nine thousand, twenty-nine".