401021633 has 4 divisors (see below), whose sum is σ = 401122260. Its totient is φ = 400921008.

The previous prime is 401021623. The next prime is 401021641. The reversal of 401021633 is 336120104.

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 130484929 + 270536704 = 11423^2 + 16448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401021633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401021603) 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, 44078 + ... + 52391.

It is an arithmetic number, because the mean of its divisors is an integer number (100280565).

Almost surely, 2^401021633 is an apocalyptic number.

It is an amenable number.

401021633 is a deficient number, since it is larger than the sum of its proper divisors (100627).

401021633 is an equidigital number, since it uses as much as digits as its factorization.

401021633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100626.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 401021633 is about 20025.5245374497. The cubic root of 401021633 is about 737.4330544615.

Adding to 401021633 its reverse (336120104), we get a palindrome (737141737).

It can be divided in two parts, 40 and 1021633, that multiplied together give a triangular number (40865320 = T₉₀₄₀).

The spelling of 401021633 in words is "four hundred one million, twenty-one thousand, six hundred thirty-three".