21472477 has 8 divisors (see below), whose sum is σ = 23224320. Its totient is φ = 19734960.

The previous prime is 21472463. The next prime is 21472481. The reversal of 21472477 is 77427412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21472477 - 2¹⁹ = 20948189 is a prime.

It is a super-2 number, since 2×21472477² = 922134537031058, 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 (21472417) 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, 349 + ... + 6562.

It is an arithmetic number, because the mean of its divisors is an integer number (2903040).

Almost surely, 2^21472477 is an apocalyptic number.

It is an amenable number.

21472477 is a deficient number, since it is larger than the sum of its proper divisors (1751843).

21472477 is a wasteful number, since it uses less digits than its factorization.

21472477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7163.

The product of its digits is 21952, while the sum is 34.

The square root of 21472477 is about 4633.8404158969. The cubic root of 21472477 is about 277.9461837065.

Adding to 21472477 its reverse (77427412), we get a palindrome (98899889).

It can be divided in two parts, 2147 and 2477, that added together give a square (4624 = 68²).

The spelling of 21472477 in words is "twenty-one million, four hundred seventy-two thousand, four hundred seventy-seven".