21541423011 has 8 divisors (see below), whose sum is σ = 29067944640. Its totient is φ = 14187925032.

The previous prime is 21541423009. The next prime is 21541423067. The reversal of 21541423011 is 11032414512.

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

It is not a de Polignac number, because 21541423011 - 2¹ = 21541423009 is a prime.

It is a super-2 number, since 2×21541423011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21541413011) 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, 43255621 + ... + 43256118.

It is an arithmetic number, because the mean of its divisors is an integer number (3633493080).

Almost surely, 2^21541423011 is an apocalyptic number.

21541423011 is a deficient number, since it is larger than the sum of its proper divisors (7526521629).

21541423011 is an equidigital number, since it uses as much as digits as its factorization.

21541423011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86511825.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21541423011 its reverse (11032414512), we get a palindrome (32573837523).

The spelling of 21541423011 in words is "twenty-one billion, five hundred forty-one million, four hundred twenty-three thousand, eleven".