21250252055653 has 8 divisors (see below), whose sum is σ = 21834669883136. Its totient is φ = 20669935406400.

The previous prime is 21250252055561. The next prime is 21250252055663. The reversal of 21250252055653 is 35655025205212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21250252055653 is a prime.

It is a super-3 number, since 3×21250252055653³ (a number of 41 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250252055663) 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, 1025284053 + ... + 1025304778.

It is an arithmetic number, because the mean of its divisors is an integer number (2729333735392).

Almost surely, 2^{21250252055653} is an apocalyptic number.

It is an amenable number.

21250252055653 is a deficient number, since it is larger than the sum of its proper divisors (584417827483).

21250252055653 is a wasteful number, since it uses less digits than its factorization.

21250252055653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050589115.

The product of its (nonzero) digits is 900000, while the sum is 43.

The spelling of 21250252055653 in words is "twenty-one trillion, two hundred fifty billion, two hundred fifty-two million, fifty-five thousand, six hundred fifty-three".