221761425514551 has 8 divisors (see below), whose sum is σ = 318426662277360. Its totient is φ = 136468569547392.

The previous prime is 221761425514543. The next prime is 221761425514693. The reversal of 221761425514551 is 155415524167122.

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

It is not a de Polignac number, because 221761425514551 - 2³ = 221761425514543 is a prime.

It is a super-2 number, since 2×221761425514551² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221761425514494 and 221761425514503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221761425518551) 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, 2843095198866 + ... + 2843095198943.

It is an arithmetic number, because the mean of its divisors is an integer number (39803332784670).

Almost surely, 2^{221761425514551} is an apocalyptic number.

221761425514551 is a deficient number, since it is larger than the sum of its proper divisors (96665236762809).

221761425514551 is a wasteful number, since it uses less digits than its factorization.

221761425514551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5686190397825.

The product of its digits is 3360000, while the sum is 51.

The spelling of 221761425514551 in words is "two hundred twenty-one trillion, seven hundred sixty-one billion, four hundred twenty-five million, five hundred fourteen thousand, five hundred fifty-one".