21224510254265 has 16 divisors (see below), whose sum is σ = 25500166780608. Its totient is φ = 16959108108096.

The previous prime is 21224510254243. The next prime is 21224510254279. The reversal of 21224510254265 is 56245201542212.

It is a cyclic number.

It is not a de Polignac number, because 21224510254265 - 2⁴² = 16826463743161 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61120307 + ... + 61466583.

It is an arithmetic number, because the mean of its divisors is an integer number (1593760423788).

Almost surely, 2^{21224510254265} is an apocalyptic number.

It is an amenable number.

21224510254265 is a deficient number, since it is larger than the sum of its proper divisors (4275656526343).

21224510254265 is a wasteful number, since it uses less digits than its factorization.

21224510254265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361048.

The product of its (nonzero) digits is 384000, while the sum is 41.

Adding to 21224510254265 its reverse (56245201542212), we get a palindrome (77469711796477).

The spelling of 21224510254265 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred ten million, two hundred fifty-four thousand, two hundred sixty-five".