412172021 has 4 divisors (see below), whose sum is σ = 436417452. Its totient is φ = 387926592.

The previous prime is 412172017. The next prime is 412172027. The reversal of 412172021 is 120271214.

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 159012100 + 253159921 = 12610^2 + 15911^2 .

It is a cyclic number.

It is not a de Polignac number, because 412172021 - 2² = 412172017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 412171984 and 412172002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (412172027) 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, 12122690 + ... + 12122723.

It is an arithmetic number, because the mean of its divisors is an integer number (109104363).

Almost surely, 2^412172021 is an apocalyptic number.

It is an amenable number.

412172021 is a deficient number, since it is larger than the sum of its proper divisors (24245431).

412172021 is a wasteful number, since it uses less digits than its factorization.

412172021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24245430.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 412172021 is about 20302.0201211604. The cubic root of 412172021 is about 744.2054324653.

The spelling of 412172021 in words is "four hundred twelve million, one hundred seventy-two thousand, twenty-one".