21454051211 has 8 divisors (see below), whose sum is σ = 21528618048. Its totient is φ = 21379600000.

The previous prime is 21454051193. The next prime is 21454051243. The reversal of 21454051211 is 11215045412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21454051211 - 2⁶ = 21454051147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21454051511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351461 + ... + 407961.

It is an arithmetic number, because the mean of its divisors is an integer number (2691077256).

Almost surely, 2^21454051211 is an apocalyptic number.

21454051211 is a deficient number, since it is larger than the sum of its proper divisors (74566837).

21454051211 is an equidigital number, since it uses as much as digits as its factorization.

21454051211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57813.

The product of its (nonzero) digits is 1600, while the sum is 26.

Adding to 21454051211 its reverse (11215045412), we get a palindrome (32669096623).

The spelling of 21454051211 in words is "twenty-one billion, four hundred fifty-four million, fifty-one thousand, two hundred eleven".