21454051193 has 2 divisors, whose sum is σ = 21454051194. Its totient is φ = 21454051192.

The previous prime is 21454051147. The next prime is 21454051243. The reversal of 21454051193 is 39115045412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19462482064 + 1991569129 = 139508^2 + 44627^2 .

It is a cyclic number.

It is not a de Polignac number, because 21454051193 - 2²⁰ = 21453002617 is a prime.

It is a super-4 number, since 4×21454051193⁴ (a number of 42 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (21454051123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727025596 + 10727025597.

It is an arithmetic number, because the mean of its divisors is an integer number (10727025597).

Almost surely, 2^21454051193 is an apocalyptic number.

It is an amenable number.

21454051193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21454051193 is an equidigital number, since it uses as much as digits as its factorization.

21454051193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The spelling of 21454051193 in words is "twenty-one billion, four hundred fifty-four million, fifty-one thousand, one hundred ninety-three".