27217772421 has 8 divisors (see below), whose sum is σ = 41474700864. Its totient is φ = 15553012800.

The previous prime is 27217772411. The next prime is 27217772431. The reversal of 27217772421 is 12427771272.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (27217772411) and next prime (27217772431).

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

It is not a de Polignac number, because 27217772421 - 2¹¹ = 27217770373 is a prime.

It is a super-2 number, since 2×27217772421² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27217772411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 648042180 + ... + 648042221.

It is an arithmetic number, because the mean of its divisors is an integer number (5184337608).

Almost surely, 2^27217772421 is an apocalyptic number.

27217772421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27217772421 is a deficient number, since it is larger than the sum of its proper divisors (14256928443).

27217772421 is a wasteful number, since it uses less digits than its factorization.

27217772421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1296084411.

The product of its digits is 153664, while the sum is 42.

The spelling of 27217772421 in words is "twenty-seven billion, two hundred seventeen million, seven hundred seventy-two thousand, four hundred twenty-one".