21225512533 has 8 divisors (see below), whose sum is σ = 22259664000. Its totient is φ = 20200636368.

The previous prime is 21225512527. The next prime is 21225512563. The reversal of 21225512533 is 33521552212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21225512533 - 2⁵ = 21225512501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21225512495 and 21225512504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225512563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2314138 + ... + 2323291.

It is an arithmetic number, because the mean of its divisors is an integer number (2782458000).

Almost surely, 2^21225512533 is an apocalyptic number.

21225512533 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21225512533 is a deficient number, since it is larger than the sum of its proper divisors (1034151467).

21225512533 is a wasteful number, since it uses less digits than its factorization.

21225512533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4637651.

The product of its digits is 18000, while the sum is 31.

The spelling of 21225512533 in words is "twenty-one billion, two hundred twenty-five million, five hundred twelve thousand, five hundred thirty-three".