21430636722 has 320 divisors, whose sum is σ = 57326911488. Its totient is φ = 5916240000.

The previous prime is 21430636697. The next prime is 21430636739. The reversal of 21430636722 is 22763603412.

21430636722 is a `hidden beast` number, since 2 + 14 + 3 + 0 + 636 + 7 + 2 + 2 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 128327083 + ... + 128327249.

Almost surely, 2^21430636722 is an apocalyptic number.

21430636722 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21430636722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28663455744).

21430636722 is an abundant number, since it is smaller than the sum of its proper divisors (35896274766).

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

21430636722 is a wasteful number, since it uses less digits than its factorization.

21430636722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The spelling of 21430636722 in words is "twenty-one billion, four hundred thirty million, six hundred thirty-six thousand, seven hundred twenty-two".