427505956921 has 4 divisors (see below), whose sum is σ = 427509351972. Its totient is φ = 427502561872.

The previous prime is 427505956903. The next prime is 427505956951. The reversal of 427505956921 is 129659505724.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 337286823696 + 90219133225 = 580764^2 + 300365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-427505956921 is a prime.

It is a super-2 number, since 2×427505956921² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427505956951) 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 3 ways as a sum of consecutive naturals, for example, 1501066 + ... + 1763011.

It is an arithmetic number, because the mean of its divisors is an integer number (106877337993).

Almost surely, 2^427505956921 is an apocalyptic number.

It is an amenable number.

427505956921 is a deficient number, since it is larger than the sum of its proper divisors (3395051).

427505956921 is a wasteful number, since it uses less digits than its factorization.

427505956921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3395050.

The product of its (nonzero) digits is 6804000, while the sum is 55.

The spelling of 427505956921 in words is "four hundred twenty-seven billion, five hundred five million, nine hundred fifty-six thousand, nine hundred twenty-one".