21406227126 has 32 divisors (see below), whose sum is σ = 43258750080. Its totient is φ = 7061356224.

The previous prime is 21406227107. The next prime is 21406227137. The reversal of 21406227126 is 62172260412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220041 + ... + 302043.

It is an arithmetic number, because the mean of its divisors is an integer number (1351835940).

Almost surely, 2^21406227126 is an apocalyptic number.

21406227126 is an abundant number, since it is smaller than the sum of its proper divisors (21852522954).

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

21406227126 is a wasteful number, since it uses less digits than its factorization.

21406227126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82460.

The product of its (nonzero) digits is 16128, while the sum is 33.

Adding to 21406227126 its reverse (62172260412), we get a palindrome (83578487538).

The spelling of 21406227126 in words is "twenty-one billion, four hundred six million, two hundred twenty-seven thousand, one hundred twenty-six".