21710901 has 12 divisors (see below), whose sum is σ = 30553152. Its totient is φ = 13711464.

The previous prime is 21710869. The next prime is 21710917. The reversal of 21710901 is 10901712.

It is not a de Polignac number, because 21710901 - 2⁵ = 21710869 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21710951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8941 + ... + 11106.

It is an arithmetic number, because the mean of its divisors is an integer number (2546096).

Almost surely, 2^21710901 is an apocalyptic number.

It is an amenable number.

21710901 is a deficient number, since it is larger than the sum of its proper divisors (8842251).

21710901 is a wasteful number, since it uses less digits than its factorization.

21710901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20088 (or 20069 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 21710901 is about 4659.4957881728. The cubic root of 21710901 is about 278.9711433266.

The spelling of 21710901 in words is "twenty-one million, seven hundred ten thousand, nine hundred one".