21042478867269 has 64 divisors (see below), whose sum is σ = 31267436544000. Its totient is φ = 12533870119680.

The previous prime is 21042478867261. The next prime is 21042478867271. The reversal of 21042478867269 is 96276887424012.

It is not a de Polignac number, because 21042478867269 - 2³ = 21042478867261 is a prime.

It is a super-2 number, since 2×21042478867269² (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 (21042478867261) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14624604 + ... + 15998874.

It is an arithmetic number, because the mean of its divisors is an integer number (488553696000).

Almost surely, 2^{21042478867269} is an apocalyptic number.

21042478867269 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21042478867269 is a deficient number, since it is larger than the sum of its proper divisors (10224957676731).

21042478867269 is a wasteful number, since it uses less digits than its factorization.

21042478867269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374538.

The product of its (nonzero) digits is 130056192, while the sum is 66.

The spelling of 21042478867269 in words is "twenty-one trillion, forty-two billion, four hundred seventy-eight million, eight hundred sixty-seven thousand, two hundred sixty-nine".