21478059 has 12 divisors (see below), whose sum is σ = 31163496. Its totient is φ = 14254272.

The previous prime is 21478057. The next prime is 21478063. The reversal of 21478059 is 95087412.

It is not a de Polignac number, because 21478059 - 2¹ = 21478057 is a prime.

It is a super-2 number, since 2×21478059² = 922614036814962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21478057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3214 + ... + 7299.

It is an arithmetic number, because the mean of its divisors is an integer number (2596958).

Almost surely, 2^21478059 is an apocalyptic number.

21478059 is a deficient number, since it is larger than the sum of its proper divisors (9685437).

21478059 is a wasteful number, since it uses less digits than its factorization.

21478059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10746 (or 10743 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 21478059 is about 4634.4426849407. The cubic root of 21478059 is about 277.9702666473.

The spelling of 21478059 in words is "twenty-one million, four hundred seventy-eight thousand, fifty-nine".