21269428169472 has 1296 divisors, whose sum is σ = 75991668480000. Its totient is φ = 5596921774080.

The previous prime is 21269428169453. The next prime is 21269428169543. The reversal of 21269428169472 is 27496182496212.

It is a happy number.

21269428169472 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 9 + 428 + 169 + 47 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 35508227029 + ... + 35508227627.

Almost surely, 2^{21269428169472} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21269428169472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37995834240000).

21269428169472 is an abundant number, since it is smaller than the sum of its proper divisors (54722240310528).

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

21269428169472 is a wasteful number, since it uses less digits than its factorization.

21269428169472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798 (or 750 counting only the distinct ones).

The product of its digits is 41803776, while the sum is 63.

The spelling of 21269428169472 in words is "twenty-one trillion, two hundred sixty-nine billion, four hundred twenty-eight million, one hundred sixty-nine thousand, four hundred seventy-two".