21273441767 has 16 divisors (see below), whose sum is σ = 22602362880. Its totient is φ = 19993240800.

The previous prime is 21273441743. The next prime is 21273441799. The reversal of 21273441767 is 76714437212.

It is a cyclic number.

It is not a de Polignac number, because 21273441767 - 2⁶ = 21273441703 is a prime.

It is a super-2 number, since 2×21273441767² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21273441737) 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, 78188 + ... + 220590.

It is an arithmetic number, because the mean of its divisors is an integer number (1412647680).

Almost surely, 2^21273441767 is an apocalyptic number.

21273441767 is a deficient number, since it is larger than the sum of its proper divisors (1328921113).

21273441767 is a wasteful number, since it uses less digits than its factorization.

21273441767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142574.

The product of its digits is 395136, while the sum is 44.

Adding to 21273441767 its reverse (76714437212), we get a palindrome (97987878979).

The spelling of 21273441767 in words is "twenty-one billion, two hundred seventy-three million, four hundred forty-one thousand, seven hundred sixty-seven".