21437420460 has 24 divisors (see below), whose sum is σ = 60024777456. Its totient is φ = 5716645440.

The previous prime is 21437420441. The next prime is 21437420519. The reversal of 21437420460 is 6402473412.

It is a super-2 number, since 2×21437420460² (a number of 21 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 178645111 + ... + 178645230.

It is an arithmetic number, because the mean of its divisors is an integer number (2501032394).

Almost surely, 2^21437420460 is an apocalyptic number.

21437420460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21437420460 is an abundant number, since it is smaller than the sum of its proper divisors (38587356996).

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

21437420460 is a wasteful number, since it uses less digits than its factorization.

21437420460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357290353 (or 357290351 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 33.

Adding to 21437420460 its reverse (6402473412), we get a palindrome (27839893872).

The spelling of 21437420460 in words is "twenty-one billion, four hundred thirty-seven million, four hundred twenty thousand, four hundred sixty".