21500542311 has 32 divisors (see below), whose sum is σ = 32097171456. Its totient is φ = 12736896000.

The previous prime is 21500542307. The next prime is 21500542369. The reversal of 21500542311 is 11324500512.

It is a happy number.

It is not a de Polignac number, because 21500542311 - 2² = 21500542307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21500542381) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101025 + ... + 230666.

It is an arithmetic number, because the mean of its divisors is an integer number (1003036608).

Almost surely, 2^21500542311 is an apocalyptic number.

21500542311 is a deficient number, since it is larger than the sum of its proper divisors (10596629145).

21500542311 is a wasteful number, since it uses less digits than its factorization.

21500542311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331783.

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 21500542311 in words is "twenty-one billion, five hundred million, five hundred forty-two thousand, three hundred eleven".