21502104303453 has 16 divisors (see below), whose sum is σ = 30356921992320. Its totient is φ = 13491067521536.

The previous prime is 21502104303377. The next prime is 21502104303461. The reversal of 21502104303453 is 35430340120512.

It is a cyclic number.

It is not a de Polignac number, because 21502104303453 - 2⁹ = 21502104302941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21502104302453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5463000 + ... + 8535137.

It is an arithmetic number, because the mean of its divisors is an integer number (1897307624520).

Almost surely, 2^{21502104303453} is an apocalyptic number.

It is an amenable number.

21502104303453 is a deficient number, since it is larger than the sum of its proper divisors (8854817688867).

21502104303453 is a wasteful number, since it uses less digits than its factorization.

21502104303453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14028276.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 21502104303453 its reverse (35430340120512), we get a palindrome (56932444423965).

The spelling of 21502104303453 in words is "twenty-one trillion, five hundred two billion, one hundred four million, three hundred three thousand, four hundred fifty-three".