421021157775 has 24 divisors (see below), whose sum is σ = 696106953744. Its totient is φ = 224538604800.

The previous prime is 421021157771. The next prime is 421021157797. The reversal of 421021157775 is 577751120124.

It is not a de Polignac number, because 421021157775 - 2² = 421021157771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421021157771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5151027 + ... + 5232123.

It is an arithmetic number, because the mean of its divisors is an integer number (29004456406).

Almost surely, 2^421021157775 is an apocalyptic number.

421021157775 is a deficient number, since it is larger than the sum of its proper divisors (275085795969).

421021157775 is a wasteful number, since it uses less digits than its factorization.

421021157775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150331 (or 150326 counting only the distinct ones).

The product of its (nonzero) digits is 137200, while the sum is 42.

Adding to 421021157775 its reverse (577751120124), we get a palindrome (998772277899).

The spelling of 421021157775 in words is "four hundred twenty-one billion, twenty-one million, one hundred fifty-seven thousand, seven hundred seventy-five".