21154520311 has 8 divisors (see below), whose sum is σ = 21981544448. Its totient is φ = 20336535000.

The previous prime is 21154520291. The next prime is 21154520323. The reversal of 21154520311 is 11302545112.

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 21154520311 - 2¹⁹ = 21153996023 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 (21154526311) 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, 2254935 + ... + 2264296.

It is an arithmetic number, because the mean of its divisors is an integer number (2747693056).

Almost surely, 2^21154520311 is an apocalyptic number.

21154520311 is a deficient number, since it is larger than the sum of its proper divisors (827024137).

21154520311 is a wasteful number, since it uses less digits than its factorization.

21154520311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4519413.

The product of its (nonzero) digits is 1200, while the sum is 25.

The spelling of 21154520311 in words is "twenty-one billion, one hundred fifty-four million, five hundred twenty thousand, three hundred eleven".