400435211021421 has 8 divisors (see below), whose sum is σ = 535152393385344. Its totient is φ = 266337418002560.

The previous prime is 400435211021393. The next prime is 400435211021437. The reversal of 400435211021421 is 124120112534004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400435211021421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400435211029421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154847334756 + ... + 154847337341.

It is an arithmetic number, because the mean of its divisors is an integer number (66894049173168).

Almost surely, 2^{400435211021421} is an apocalyptic number.

It is an amenable number.

400435211021421 is a deficient number, since it is larger than the sum of its proper divisors (134717182363923).

400435211021421 is a wasteful number, since it uses less digits than its factorization.

400435211021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309694672531.

The product of its (nonzero) digits is 7680, while the sum is 30.

Adding to 400435211021421 its reverse (124120112534004), we get a palindrome (524555323555425).

The spelling of 400435211021421 in words is "four hundred trillion, four hundred thirty-five billion, two hundred eleven million, twenty-one thousand, four hundred twenty-one".