21401108 has 6 divisors (see below), whose sum is σ = 37451946. Its totient is φ = 10700552.

The previous prime is 21401089. The next prime is 21401111. The reversal of 21401108 is 80110412.

It can be written as a sum of positive squares in only one way, i.e., 19518724 + 1882384 = 4418^2 + 1372^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2675135 + ... + 2675142.

It is an arithmetic number, because the mean of its divisors is an integer number (6241991).

Almost surely, 2^21401108 is an apocalyptic number.

It is an amenable number.

21401108 is a deficient number, since it is larger than the sum of its proper divisors (16050838).

21401108 is a wasteful number, since it uses less digits than its factorization.

21401108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5350281 (or 5350279 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 21401108 is about 4626.1331584813. The cubic root of 21401108 is about 277.6379013215.

The spelling of 21401108 in words is "twenty-one million, four hundred one thousand, one hundred eight".