21124642053126 has 128 divisors (see below), whose sum is σ = 47079065594880. Its totient is φ = 6288562925568.

The previous prime is 21124642053071. The next prime is 21124642053131. The reversal of 21124642053126 is 62135024642112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 248211036 + ... + 248296128.

It is an arithmetic number, because the mean of its divisors is an integer number (367805199960).

Almost surely, 2^{21124642053126} is an apocalyptic number.

21124642053126 is an abundant number, since it is smaller than the sum of its proper divisors (25954423541754).

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

21124642053126 is a wasteful number, since it uses less digits than its factorization.

21124642053126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86510.

The product of its (nonzero) digits is 138240, while the sum is 39.

Adding to 21124642053126 its reverse (62135024642112), we get a palindrome (83259666695238).

The spelling of 21124642053126 in words is "twenty-one trillion, one hundred twenty-four billion, six hundred forty-two million, fifty-three thousand, one hundred twenty-six".