21095308885 has 32 divisors (see below), whose sum is σ = 31435776000. Its totient is φ = 13261942080.

The previous prime is 21095308879. The next prime is 21095308907. The reversal of 21095308885 is 58880359012.

It is not a de Polignac number, because 21095308885 - 2⁵ = 21095308853 is a prime.

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, 491035 + ... + 532264.

It is an arithmetic number, because the mean of its divisors is an integer number (982368000).

Almost surely, 2^21095308885 is an apocalyptic number.

It is an amenable number.

21095308885 is a deficient number, since it is larger than the sum of its proper divisors (10340467115).

21095308885 is a wasteful number, since it uses less digits than its factorization.

21095308885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023361.

The product of its (nonzero) digits is 691200, while the sum is 49.

The spelling of 21095308885 in words is "twenty-one billion, ninety-five million, three hundred eight thousand, eight hundred eighty-five".