401423610521 has 4 divisors (see below), whose sum is σ = 405320927232. Its totient is φ = 397526293812.

The previous prime is 401423610517. The next prime is 401423610559. The reversal of 401423610521 is 125016324104.

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 not a de Polignac number, because 401423610521 - 2² = 401423610517 is a prime.

It is a super-2 number, since 2×401423610521² (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 (401423210521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1948658201 + ... + 1948658406.

It is an arithmetic number, because the mean of its divisors is an integer number (101330231808).

Almost surely, 2^401423610521 is an apocalyptic number.

It is an amenable number.

401423610521 is a deficient number, since it is larger than the sum of its proper divisors (3897316711).

401423610521 is a wasteful number, since it uses less digits than its factorization.

401423610521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3897316710.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 401423610521 its reverse (125016324104), we get a palindrome (526439934625).

The spelling of 401423610521 in words is "four hundred one billion, four hundred twenty-three million, six hundred ten thousand, five hundred twenty-one".