21734019273851 has 2 divisors, whose sum is σ = 21734019273852. Its totient is φ = 21734019273850.

The previous prime is 21734019273823. The next prime is 21734019273929. The reversal of 21734019273851 is 15837291043712.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21734019273851 - 2²² = 21734015079547 is a prime.

It is a super-2 number, since 2×21734019273851² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21734019273793 and 21734019273802.

It is not a weakly prime, because it can be changed into another prime (21734019273151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10867009636925 + 10867009636926.

It is an arithmetic number, because the mean of its divisors is an integer number (10867009636926).

Almost surely, 2^{21734019273851} is an apocalyptic number.

21734019273851 is a deficient number, since it is larger than the sum of its proper divisors (1).

21734019273851 is an equidigital number, since it uses as much as digits as its factorization.

21734019273851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 21734019273851 in words is "twenty-one trillion, seven hundred thirty-four billion, nineteen million, two hundred seventy-three thousand, eight hundred fifty-one".