21603156025253 has 8 divisors (see below), whose sum is σ = 23569518819936. Its totient is φ = 19637199817200.

The previous prime is 21603156025247. The next prime is 21603156025261. The reversal of 21603156025253 is 35252065130612.

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 21603156025253 - 2⁸ = 21603156024997 is a prime.

It is a super-3 number, since 3×21603156025253³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

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 21603156025253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21603156027253) 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, 101535551 + ... + 101748092.

It is an arithmetic number, because the mean of its divisors is an integer number (2946189852492).

Almost surely, 2^{21603156025253} is an apocalyptic number.

It is an amenable number.

21603156025253 is a deficient number, since it is larger than the sum of its proper divisors (1966362794683).

21603156025253 is a wasteful number, since it uses less digits than its factorization.

21603156025253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203293315.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 21603156025253 in words is "twenty-one trillion, six hundred three billion, one hundred fifty-six million, twenty-five thousand, two hundred fifty-three".