21422556132978 has 768 divisors, whose sum is σ = 62960332603392. Its totient is φ = 4767372288000.

The previous prime is 21422556132889. The next prime is 21422556133007. The reversal of 21422556132978 is 87923165522412.

It is a super-2 number, since 2×21422556132978² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 3423771226 + ... + 3423777482.

It is an arithmetic number, because the mean of its divisors is an integer number (81979599744).

Almost surely, 2^{21422556132978} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21422556132978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31480166301696).

21422556132978 is an abundant number, since it is smaller than the sum of its proper divisors (41537776470414).

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

21422556132978 is a wasteful number, since it uses less digits than its factorization.

21422556132978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6439 (or 6432 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 57.

The spelling of 21422556132978 in words is "twenty-one trillion, four hundred twenty-two billion, five hundred fifty-six million, one hundred thirty-two thousand, nine hundred seventy-eight".