21101307838 has 16 divisors (see below), whose sum is σ = 34091575056. Its totient is φ = 9737680320.

The previous prime is 21101307833. The next prime is 21101307839. The reversal of 21101307838 is 83870310112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101307833) 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, 141658 + ... + 249538.

It is an arithmetic number, because the mean of its divisors is an integer number (2130723441).

Almost surely, 2^21101307838 is an apocalyptic number.

21101307838 is a deficient number, since it is larger than the sum of its proper divisors (12990267218).

21101307838 is a wasteful number, since it uses less digits than its factorization.

21101307838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115419.

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 21101307838 in words is "twenty-one billion, one hundred one million, three hundred seven thousand, eight hundred thirty-eight".