21126526246 has 64 divisors (see below), whose sum is σ = 40419025920. Its totient is φ = 8062433280.

The previous prime is 21126526231. The next prime is 21126526247. The reversal of 21126526246 is 64262562112.

It is a happy number.

It is a super-2 number, since 2×21126526246² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126526247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3981231 + ... + 3986533.

It is an arithmetic number, because the mean of its divisors is an integer number (631547280).

Almost surely, 2^21126526246 is an apocalyptic number.

21126526246 is a deficient number, since it is larger than the sum of its proper divisors (19292499674).

21126526246 is a wasteful number, since it uses less digits than its factorization.

21126526246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6229.

The product of its digits is 69120, while the sum is 37.

The spelling of 21126526246 in words is "twenty-one billion, one hundred twenty-six million, five hundred twenty-six thousand, two hundred forty-six".