21237541305 has 8 divisors (see below), whose sum is σ = 33980066112. Its totient is φ = 11326688688.

The previous prime is 21237541301. The next prime is 21237541393. The reversal of 21237541305 is 50314573212.

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

It is not a de Polignac number, because 21237541305 - 2² = 21237541301 is a prime.

It is a super-2 number, since 2×21237541305² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21237541301) 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, 707918029 + ... + 707918058.

It is an arithmetic number, because the mean of its divisors is an integer number (4247508264).

Almost surely, 2^21237541305 is an apocalyptic number.

It is an amenable number.

21237541305 is a deficient number, since it is larger than the sum of its proper divisors (12742524807).

21237541305 is a wasteful number, since it uses less digits than its factorization.

21237541305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1415836095.

The product of its (nonzero) digits is 25200, while the sum is 33.

The spelling of 21237541305 in words is "twenty-one billion, two hundred thirty-seven million, five hundred forty-one thousand, three hundred five".