212155001 has 4 divisors (see below), whose sum is σ = 212250612. Its totient is φ = 212059392.

The previous prime is 212154983. The next prime is 212155061. The reversal of 212155001 is 100551212.

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 142181776 + 69973225 = 11924^2 + 8365^2 .

It is a cyclic number.

It is not a de Polignac number, because 212155001 - 2⁶ = 212154937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212155061) 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, 44396 + ... + 48941.

It is an arithmetic number, because the mean of its divisors is an integer number (53062653).

Almost surely, 2^212155001 is an apocalyptic number.

It is an amenable number.

212155001 is a deficient number, since it is larger than the sum of its proper divisors (95611).

212155001 is an equidigital number, since it uses as much as digits as its factorization.

212155001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95610.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 212155001 is about 14565.5415621940. The cubic root of 212155001 is about 596.4184794633.

The spelling of 212155001 in words is "two hundred twelve million, one hundred fifty-five thousand, one".