21479948 has 24 divisors (see below), whose sum is σ = 43276800. Its totient is φ = 9137808.

The previous prime is 21479917. The next prime is 21479957. The reversal of 21479948 is 84997412.

It is a super-2 number, since 2×21479948² = 922776332165408, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21479899 and 21479908.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1133 + ... + 6651.

It is an arithmetic number, because the mean of its divisors is an integer number (1803200).

Almost surely, 2^21479948 is an apocalyptic number.

21479948 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21479948 is an abundant number, since it is smaller than the sum of its proper divisors (21796852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21479948 is a wasteful number, since it uses less digits than its factorization.

21479948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5669 (or 5667 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 21479948 is about 4634.6464805851. The cubic root of 21479948 is about 277.9784155904.

The spelling of 21479948 in words is "twenty-one million, four hundred seventy-nine thousand, nine hundred forty-eight".