401022021 has 8 divisors (see below), whose sum is σ = 549147424. Its totient is φ = 260122320.

The previous prime is 401021953. The next prime is 401022023. The reversal of 401022021 is 120220104.

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

It is not a de Polignac number, because 401022021 - 2²⁵ = 367467589 is a prime.

It is a super-2 number, since 2×401022021² = 321637322653848882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401021988 and 401022006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401022023) 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, 1806295 + ... + 1806516.

It is an arithmetic number, because the mean of its divisors is an integer number (68643428).

Almost surely, 2^401022021 is an apocalyptic number.

It is an amenable number.

401022021 is a deficient number, since it is larger than the sum of its proper divisors (148125403).

401022021 is a wasteful number, since it uses less digits than its factorization.

401022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612851.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 401022021 is about 20025.5342250837. The cubic root of 401022021 is about 737.4332922906.

Adding to 401022021 its reverse (120220104), we get a palindrome (521242125).

The spelling of 401022021 in words is "four hundred one million, twenty-two thousand, twenty-one".