19621117951 has 2 divisors, whose sum is σ = 19621117952. Its totient is φ = 19621117950.

The previous prime is 19621117889. The next prime is 19621117963. The reversal of 19621117951 is 15971112691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19621117951 - 2²³ = 19612729343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19621117898 and 19621117907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19621117981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9810558975 + 9810558976.

It is an arithmetic number, because the mean of its divisors is an integer number (9810558976).

Almost surely, 2^19621117951 is an apocalyptic number.

19621117951 is a deficient number, since it is larger than the sum of its proper divisors (1).

19621117951 is an equidigital number, since it uses as much as digits as its factorization.

19621117951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34020, while the sum is 43.

The spelling of 19621117951 in words is "nineteen billion, six hundred twenty-one million, one hundred seventeen thousand, nine hundred fifty-one".