21827420160 has 608 divisors, whose sum is σ = 87375574272. Its totient is φ = 4529848320.

The previous prime is 21827420123. The next prime is 21827420177. The reversal of 21827420160 is 6102472812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 357826530 + ... + 357826590.

Almost surely, 2^21827420160 is an apocalyptic number.

21827420160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21827420160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43687787136).

21827420160 is an abundant number, since it is smaller than the sum of its proper divisors (65548154112).

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

21827420160 is an frugal number, since it uses more digits than its factorization.

21827420160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

Adding to 21827420160 its reverse (6102472812), we get a palindrome (27929892972).

The spelling of 21827420160 in words is "twenty-one billion, eight hundred twenty-seven million, four hundred twenty thousand, one hundred sixty".