21404503350 has 72 divisors (see below), whose sum is σ = 59361861312. Its totient is φ = 5523739200.

The previous prime is 21404503331. The next prime is 21404503357. The reversal of 21404503350 is 5330540412.

It is a super-2 number, since 2×21404503350² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404503357) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 753237 + ... + 781136.

It is an arithmetic number, because the mean of its divisors is an integer number (824470296).

Almost surely, 2^21404503350 is an apocalyptic number.

21404503350 is an abundant number, since it is smaller than the sum of its proper divisors (37957357962).

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

21404503350 is a wasteful number, since it uses less digits than its factorization.

21404503350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534422 (or 1534414 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The spelling of 21404503350 in words is "twenty-one billion, four hundred four million, five hundred three thousand, three hundred fifty".