21010211138 has 16 divisors (see below), whose sum is σ = 36103475520. Its totient is φ = 8982883536.

The previous prime is 21010211137. The next prime is 21010211161. The reversal of 21010211138 is 83111201012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21010211137) 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, 1784981 + ... + 1796712.

It is an arithmetic number, because the mean of its divisors is an integer number (2256467220).

Almost surely, 2^21010211138 is an apocalyptic number.

21010211138 is a deficient number, since it is larger than the sum of its proper divisors (15093264382).

21010211138 is a wasteful number, since it uses less digits than its factorization.

21010211138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3582121.

The product of its (nonzero) digits is 96, while the sum is 20.

The spelling of 21010211138 in words is "twenty-one billion, ten million, two hundred eleven thousand, one hundred thirty-eight".