21148426 has 8 divisors (see below), whose sum is σ = 34162884. Its totient is φ = 9760800.

The previous prime is 21148411. The next prime is 21148427. The reversal of 21148426 is 62484112.

It can be written as a sum of positive squares in 2 ways, for example, as 20657025 + 491401 = 4545^2 + 701^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21148394 and 21148403.

It is not an unprimeable number, because it can be changed into a prime (21148427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406675 + ... + 406726.

Almost surely, 2^21148426 is an apocalyptic number.

21148426 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21148426 is a deficient number, since it is larger than the sum of its proper divisors (13014458).

21148426 is a wasteful number, since it uses less digits than its factorization.

21148426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813416.

The product of its digits is 3072, while the sum is 28.

The square root of 21148426 is about 4598.7417844450. The cubic root of 21148426 is about 276.5408860358.

The spelling of 21148426 in words is "twenty-one million, one hundred forty-eight thousand, four hundred twenty-six".