21267983126 has 48 divisors (see below), whose sum is σ = 35031127824. Its totient is φ = 9678569472.

The previous prime is 21267983123. The next prime is 21267983131. The reversal of 21267983126 is 62138976212.

It is a super-3 number, since 3×21267983126³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21267983123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10064246 + ... + 10066358.

It is an arithmetic number, because the mean of its divisors is an integer number (729815163).

Almost surely, 2^21267983126 is an apocalyptic number.

21267983126 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21267983126 is a deficient number, since it is larger than the sum of its proper divisors (13763144698).

21267983126 is a wasteful number, since it uses less digits than its factorization.

21267983126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545 (or 2532 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The spelling of 21267983126 in words is "twenty-one billion, two hundred sixty-seven million, nine hundred eighty-three thousand, one hundred twenty-six".