21088863837 has 16 divisors (see below), whose sum is σ = 31245473280. Its totient is φ = 14058022176.

The previous prime is 21088863833. The next prime is 21088863863. The reversal of 21088863837 is 73836888012.

It is not a de Polignac number, because 21088863837 - 2² = 21088863833 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21088863833) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 370708 + ... + 423794.

It is an arithmetic number, because the mean of its divisors is an integer number (1952842080).

Almost surely, 2^21088863837 is an apocalyptic number.

21088863837 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21088863837 is a deficient number, since it is larger than the sum of its proper divisors (10156609443).

21088863837 is a wasteful number, since it uses less digits than its factorization.

21088863837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67809 (or 67803 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 21088863837 in words is "twenty-one billion, eighty-eight million, eight hundred sixty-three thousand, eight hundred thirty-seven".