21211010219929 has 2 divisors, whose sum is σ = 21211010219930. Its totient is φ = 21211010219928.

The previous prime is 21211010219923. The next prime is 21211010219939. The reversal of 21211010219929 is 92991201011212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20652662030400 + 558348189529 = 4544520^2 + 747227^2 .

It is a cyclic number.

It is not a de Polignac number, because 21211010219929 - 2²⁹ = 21210473349017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21211010219891 and 21211010219900.

It is not a weakly prime, because it can be changed into another prime (21211010219923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605505109964 + 10605505109965.

It is an arithmetic number, because the mean of its divisors is an integer number (10605505109965).

Almost surely, 2^{21211010219929} is an apocalyptic number.

It is an amenable number.

21211010219929 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211010219929 is an equidigital number, since it uses as much as digits as its factorization.

21211010219929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 40.

The spelling of 21211010219929 in words is "twenty-one trillion, two hundred eleven billion, ten million, two hundred nineteen thousand, nine hundred twenty-nine".