21311925475199 has 4 divisors (see below), whose sum is σ = 21311946114360. Its totient is φ = 21311904836040.

The previous prime is 21311925475157. The next prime is 21311925475277. The reversal of 21311925475199 is 99157452911312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21311925475199 - 2¹² = 21311925471103 is a prime.

It is a super-2 number, since 2×21311925475199² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311925415199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8684309 + ... + 10864670.

It is an arithmetic number, because the mean of its divisors is an integer number (5327986528590).

Almost surely, 2^{21311925475199} is an apocalyptic number.

21311925475199 is a deficient number, since it is larger than the sum of its proper divisors (20639161).

21311925475199 is a wasteful number, since it uses less digits than its factorization.

21311925475199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20639160.

The product of its digits is 6123600, while the sum is 59.

The spelling of 21311925475199 in words is "twenty-one trillion, three hundred eleven billion, nine hundred twenty-five million, four hundred seventy-five thousand, one hundred ninety-nine".