400210101 has 6 divisors (see below), whose sum is σ = 578081270. Its totient is φ = 266806728.

The previous prime is 400210087. The next prime is 400210103. The reversal of 400210101 is 101012004.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 319479876 + 80730225 = 17874^2 + 8985^2 .

It is not a de Polignac number, because 400210101 - 2⁷ = 400209973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 44467789 = 400210101 / (4 + 0 + 0 + 2 + 1 + 0 + 1 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400210103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22233886 + ... + 22233903.

Almost surely, 2^400210101 is an apocalyptic number.

It is an amenable number.

400210101 is a deficient number, since it is larger than the sum of its proper divisors (177871169).

400210101 is a wasteful number, since it uses less digits than its factorization.

400210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44467795 (or 44467792 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 400210101 is about 20005.2518354556. The cubic root of 400210101 is about 736.9352802652.

Adding to 400210101 its reverse (101012004), we get a palindrome (501222105).

The spelling of 400210101 in words is "four hundred million, two hundred ten thousand, one hundred one".