21053126 has 4 divisors (see below), whose sum is σ = 31579692. Its totient is φ = 10526562.

The previous prime is 21053117. The next prime is 21053129. The reversal of 21053126 is 62135012.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21053126² = 886468228743752, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21053098 and 21053107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21053129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5263280 + ... + 5263283.

It is an arithmetic number, because the mean of its divisors is an integer number (7894923).

Almost surely, 2^21053126 is an apocalyptic number.

21053126 is a deficient number, since it is larger than the sum of its proper divisors (10526566).

21053126 is a wasteful number, since it uses less digits than its factorization.

21053126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10526565.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 21053126 is about 4588.3685553800. The cubic root of 21053126 is about 276.1248734804.

Adding to 21053126 its reverse (62135012), we get a palindrome (83188138).

The spelling of 21053126 in words is "twenty-one million, fifty-three thousand, one hundred twenty-six".