21266740739988 has 48 divisors (see below), whose sum is σ = 55141339518720. Its totient is φ = 7088226364800.

The previous prime is 21266740739963. The next prime is 21266740739989. The reversal of 21266740739988 is 88993704766212.

21266740739988 is a `hidden beast` number, since 2 + 126 + 6 + 7 + 407 + 3 + 9 + 98 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21266740739989) 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, 8424828 + ... + 10654163.

It is an arithmetic number, because the mean of its divisors is an integer number (1148777906640).

Almost surely, 2^{21266740739988} is an apocalyptic number.

It is an amenable number.

21266740739988 is an abundant number, since it is smaller than the sum of its proper divisors (33874598778732).

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

21266740739988 is a wasteful number, since it uses less digits than its factorization.

21266740739988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19089325 (or 19089317 counting only the distinct ones).

The product of its (nonzero) digits is 438939648, while the sum is 72.

The spelling of 21266740739988 in words is "twenty-one trillion, two hundred sixty-six billion, seven hundred forty million, seven hundred thirty-nine thousand, nine hundred eighty-eight".