21154501141 has 4 divisors (see below), whose sum is σ = 21470240032. Its totient is φ = 20838762252.

The previous prime is 21154501127. The next prime is 21154501169. The reversal of 21154501141 is 14110545112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21154501141 - 2⁷ = 21154501013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154501111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157869345 + ... + 157869478.

It is an arithmetic number, because the mean of its divisors is an integer number (5367560008).

Almost surely, 2^21154501141 is an apocalyptic number.

It is an amenable number.

21154501141 is a deficient number, since it is larger than the sum of its proper divisors (315738891).

21154501141 is an equidigital number, since it uses as much as digits as its factorization.

21154501141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315738890.

The product of its (nonzero) digits is 800, while the sum is 25.

The spelling of 21154501141 in words is "twenty-one billion, one hundred fifty-four million, five hundred one thousand, one hundred forty-one".