21407421364 has 24 divisors (see below), whose sum is σ = 42844431168. Its totient is φ = 9168268800.

The previous prime is 21407421361. The next prime is 21407421401. The reversal of 21407421364 is 46312470412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21407421361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222829 + ... + 304084.

It is an arithmetic number, because the mean of its divisors is an integer number (1785184632).

Almost surely, 2^21407421364 is an apocalyptic number.

It is an amenable number.

21407421364 is an abundant number, since it is smaller than the sum of its proper divisors (21437009804).

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

21407421364 is a wasteful number, since it uses less digits than its factorization.

21407421364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528375 (or 528373 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

Adding to 21407421364 its reverse (46312470412), we get a palindrome (67719891776).

The spelling of 21407421364 in words is "twenty-one billion, four hundred seven million, four hundred twenty-one thousand, three hundred sixty-four".