21452342280 has 64 divisors (see below), whose sum is σ = 64826835840. Its totient is φ = 5678863872.

The previous prime is 21452342269. The next prime is 21452342291. The reversal of 21452342280 is 8224325412.

It is an interprime number because it is at equal distance from previous prime (21452342269) and next prime (21452342291).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 636004 + ... + 668883.

It is an arithmetic number, because the mean of its divisors is an integer number (1012919310).

Almost surely, 2^21452342280 is an apocalyptic number.

21452342280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21452342280 is an abundant number, since it is smaller than the sum of its proper divisors (43374493560).

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

21452342280 is a wasteful number, since it uses less digits than its factorization.

21452342280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305038 (or 1305034 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

Adding to 21452342280 its reverse (8224325412), we get a palindrome (29676667692).

The spelling of 21452342280 in words is "twenty-one billion, four hundred fifty-two million, three hundred forty-two thousand, two hundred eighty".