21417551450 has 24 divisors (see below), whose sum is σ = 41933313120. Its totient is φ = 8116124400.

The previous prime is 21417551443. The next prime is 21417551459. The reversal of 21417551450 is 5415571412.

It is a super-3 number, since 3×21417551450³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21417551450.

It is not an unprimeable number, because it can be changed into a prime (21417551459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11271446 + ... + 11273345.

It is an arithmetic number, because the mean of its divisors is an integer number (1747221380).

Almost surely, 2^21417551450 is an apocalyptic number.

21417551450 is a deficient number, since it is larger than the sum of its proper divisors (20515761670).

21417551450 is a wasteful number, since it uses less digits than its factorization.

21417551450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22544822 (or 22544817 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 35.

The spelling of 21417551450 in words is "twenty-one billion, four hundred seventeen million, five hundred fifty-one thousand, four hundred fifty".