21124151642026 has 8 divisors (see below), whose sum is σ = 31917513795300. Its totient is φ = 10484980376928.

The previous prime is 21124151641993. The next prime is 21124151642029. The reversal of 21124151642026 is 62024615142112.

It can be written as a sum of positive squares in 2 ways, for example, as 18363067596225 + 2761084045801 = 4285215^2 + 1661651^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21124151642029) 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, 38547721701 + ... + 38547722248.

Almost surely, 2^{21124151642026} is an apocalyptic number.

21124151642026 is a deficient number, since it is larger than the sum of its proper divisors (10793362153274).

21124151642026 is a wasteful number, since it uses less digits than its factorization.

21124151642026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77095444088.

The product of its (nonzero) digits is 46080, while the sum is 37.

Adding to 21124151642026 its reverse (62024615142112), we get a palindrome (83148766784138).

The spelling of 21124151642026 in words is "twenty-one trillion, one hundred twenty-four billion, one hundred fifty-one million, six hundred forty-two thousand, twenty-six".