21126475 has 12 divisors (see below), whose sum is σ = 26348760. Its totient is φ = 16803200.

The previous prime is 21126467. The next prime is 21126481. The reversal of 21126475 is 57462112.

It is not a de Polignac number, because 21126475 - 2³ = 21126467 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2115 + ... + 6835.

It is an arithmetic number, because the mean of its divisors is an integer number (2195730).

Almost surely, 2^21126475 is an apocalyptic number.

21126475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21126475 is a deficient number, since it is larger than the sum of its proper divisors (5222285).

21126475 is a wasteful number, since it uses less digits than its factorization.

21126475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4910 (or 4905 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 21126475 is about 4596.3545337582. The cubic root of 21126475 is about 276.4451744142.

Adding to 21126475 its reverse (57462112), we get a palindrome (78588587).

The spelling of 21126475 in words is "twenty-one million, one hundred twenty-six thousand, four hundred seventy-five".