21475201 has 6 divisors (see below), whose sum is σ = 23605106. Its totient is φ = 19522800.

The previous prime is 21475183. The next prime is 21475217. The reversal of 21475201 is 10257412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19847025 + 1628176 = 4455^2 + 1276^2 .

It is not a de Polignac number, because 21475201 - 2¹⁹ = 20950913 is a prime.

It is a super-2 number, since 2×21475201² = 922368515980802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21475231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88620 + ... + 88861.

Almost surely, 2^21475201 is an apocalyptic number.

It is an amenable number.

21475201 is a deficient number, since it is larger than the sum of its proper divisors (2129905).

21475201 is a wasteful number, since it uses less digits than its factorization.

21475201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177503 (or 177492 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 21475201 is about 4634.1343312425. The cubic root of 21475201 is about 277.9579366340.

The spelling of 21475201 in words is "twenty-one million, four hundred seventy-five thousand, two hundred one".