21837154793 has 2 divisors, whose sum is σ = 21837154794. Its totient is φ = 21837154792.

The previous prime is 21837154777. The next prime is 21837154837. The reversal of 21837154793 is 39745173812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20790179344 + 1046975449 = 144188^2 + 32357^2 .

It is a cyclic number.

It is not a de Polignac number, because 21837154793 - 2⁴ = 21837154777 is a prime.

It is a super-2 number, since 2×21837154793² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21837154763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10918577396 + 10918577397.

It is an arithmetic number, because the mean of its divisors is an integer number (10918577397).

Almost surely, 2^21837154793 is an apocalyptic number.

It is an amenable number.

21837154793 is a deficient number, since it is larger than the sum of its proper divisors (1).

21837154793 is an equidigital number, since it uses as much as digits as its factorization.

21837154793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 50.

The spelling of 21837154793 in words is "twenty-one billion, eight hundred thirty-seven million, one hundred fifty-four thousand, seven hundred ninety-three".