21202145454 has 48 divisors (see below), whose sum is σ = 49339929600. Its totient is φ = 6056222256.

The previous prime is 21202145431. The next prime is 21202145479. The reversal of 21202145454 is 45454120212.

It is a super-2 number, since 2×21202145454² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1692787 + ... + 1705265.

It is an arithmetic number, because the mean of its divisors is an integer number (1027915200).

Almost surely, 2^21202145454 is an apocalyptic number.

21202145454 is an abundant number, since it is smaller than the sum of its proper divisors (28137784146).

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

21202145454 is a wasteful number, since it uses less digits than its factorization.

21202145454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18277 (or 18270 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 21202145454 its reverse (45454120212), we get a palindrome (66656265666).

The spelling of 21202145454 in words is "twenty-one billion, two hundred two million, one hundred forty-five thousand, four hundred fifty-four".