421726685137 has 4 divisors (see below), whose sum is σ = 443922826480. Its totient is φ = 399530543796.

The previous prime is 421726685101. The next prime is 421726685141. The reversal of 421726685137 is 731586627124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421726685137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421726685837) 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, 11098070643 + ... + 11098070680.

It is an arithmetic number, because the mean of its divisors is an integer number (110980706620).

Almost surely, 2^421726685137 is an apocalyptic number.

It is an amenable number.

421726685137 is a deficient number, since it is larger than the sum of its proper divisors (22196141343).

421726685137 is a wasteful number, since it uses less digits than its factorization.

421726685137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22196141342.

The product of its digits is 3386880, while the sum is 52.

The spelling of 421726685137 in words is "four hundred twenty-one billion, seven hundred twenty-six million, six hundred eighty-five thousand, one hundred thirty-seven".