21727132312126 has 4 divisors (see below), whose sum is σ = 32590698468192. Its totient is φ = 10863566156062.

The previous prime is 21727132312117. The next prime is 21727132312133. The reversal of 21727132312126 is 62121323172712.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5431783078030 + ... + 5431783078033.

It is an arithmetic number, because the mean of its divisors is an integer number (8147674617048).

Almost surely, 2^{21727132312126} is an apocalyptic number.

21727132312126 is a deficient number, since it is larger than the sum of its proper divisors (10863566156066).

21727132312126 is a wasteful number, since it uses less digits than its factorization.

21727132312126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10863566156065.

The product of its digits is 84672, while the sum is 40.

Adding to 21727132312126 its reverse (62121323172712), we get a palindrome (83848455484838).

The spelling of 21727132312126 in words is "twenty-one trillion, seven hundred twenty-seven billion, one hundred thirty-two million, three hundred twelve thousand, one hundred twenty-six".