21237745011 has 8 divisors (see below), whose sum is σ = 32362278144. Its totient is φ = 12135854280.

The previous prime is 21237744967. The next prime is 21237745049. The reversal of 21237745011 is 11054773212.

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

It is not a de Polignac number, because 21237745011 - 2¹⁴ = 21237728627 is a prime.

It is a super-3 number, since 3×21237745011³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21237745051) 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, 505660575 + ... + 505660616.

It is an arithmetic number, because the mean of its divisors is an integer number (4045284768).

Almost surely, 2^21237745011 is an apocalyptic number.

21237745011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21237745011 is a deficient number, since it is larger than the sum of its proper divisors (11124533133).

21237745011 is a wasteful number, since it uses less digits than its factorization.

21237745011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011321201.

The product of its (nonzero) digits is 11760, while the sum is 33.

The spelling of 21237745011 in words is "twenty-one billion, two hundred thirty-seven million, seven hundred forty-five thousand, eleven".