21236011375 has 32 divisors (see below), whose sum is σ = 27495936000. Its totient is φ = 16357572000.

The previous prime is 21236011309. The next prime is 21236011427. The reversal of 21236011375 is 57311063212.

It is a happy number.

It is not a de Polignac number, because 21236011375 - 2¹³ = 21236003183 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 757356 + ... + 784894.

It is an arithmetic number, because the mean of its divisors is an integer number (859248000).

Almost surely, 2^21236011375 is an apocalyptic number.

21236011375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21236011375 is a deficient number, since it is larger than the sum of its proper divisors (6259924625).

21236011375 is a wasteful number, since it uses less digits than its factorization.

21236011375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27784 (or 27774 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

Adding to 21236011375 its reverse (57311063212), we get a palindrome (78547074587).

The spelling of 21236011375 in words is "twenty-one billion, two hundred thirty-six million, eleven thousand, three hundred seventy-five".