21403227447231 has 16 divisors (see below), whose sum is σ = 33372917217024. Its totient is φ = 11945987411904.

The previous prime is 21403227447229. The next prime is 21403227447253. The reversal of 21403227447231 is 13274472230412.

It is not a de Polignac number, because 21403227447231 - 2¹ = 21403227447229 is a prime.

It is a super-2 number, since 2×21403227447231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403227447331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11851177086 + ... + 11851178891.

It is an arithmetic number, because the mean of its divisors is an integer number (2085807326064).

Almost surely, 2^{21403227447231} is an apocalyptic number.

21403227447231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21403227447231 is a deficient number, since it is larger than the sum of its proper divisors (11969689769793).

21403227447231 is a wasteful number, since it uses less digits than its factorization.

21403227447231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23702356030.

The product of its (nonzero) digits is 451584, while the sum is 42.

Adding to 21403227447231 its reverse (13274472230412), we get a palindrome (34677699677643).

The spelling of 21403227447231 in words is "twenty-one trillion, four hundred three billion, two hundred twenty-seven million, four hundred forty-seven thousand, two hundred thirty-one".