20979229351 has 2 divisors, whose sum is σ = 20979229352. Its totient is φ = 20979229350.

The previous prime is 20979229303. The next prime is 20979229393. The reversal of 20979229351 is 15392297902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20979229351 - 2⁹ = 20979228839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20979229295 and 20979229304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20979220351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10489614675 + 10489614676.

It is an arithmetic number, because the mean of its divisors is an integer number (10489614676).

Almost surely, 2^20979229351 is an apocalyptic number.

20979229351 is a deficient number, since it is larger than the sum of its proper divisors (1).

20979229351 is an equidigital number, since it uses as much as digits as its factorization.

20979229351 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 49.

The spelling of 20979229351 in words is "twenty billion, nine hundred seventy-nine million, two hundred twenty-nine thousand, three hundred fifty-one".