21220000677929 has 2 divisors, whose sum is σ = 21220000677930. Its totient is φ = 21220000677928.

The previous prime is 21220000677919. The next prime is 21220000677991. The reversal of 21220000677929 is 92977600002212.

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., 19997755453225 + 1222245224704 = 4471885^2 + 1105552^2 .

It is a cyclic number.

It is not a de Polignac number, because 21220000677929 - 2²⁸ = 21219732242473 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21220000677919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610000338964 + 10610000338965.

It is an arithmetic number, because the mean of its divisors is an integer number (10610000338965).

Almost surely, 2^{21220000677929} is an apocalyptic number.

It is an amenable number.

21220000677929 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220000677929 is an equidigital number, since it uses as much as digits as its factorization.

21220000677929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 47.

The spelling of 21220000677929 in words is "twenty-one trillion, two hundred twenty billion, six hundred seventy-seven thousand, nine hundred twenty-nine".