999213210001 has 4 divisors (see below), whose sum is σ = 1000772045604. Its totient is φ = 997654374400.

The previous prime is 999213209987. The next prime is 999213210011. The reversal of 999213210001 is 100012312999.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 100012312999 = 1201 ⋅83274199.

It can be written as a sum of positive squares in 2 ways, for example, as 765730003600 + 233483206401 = 875060^2 + 483201^2 .

It is a cyclic number.

It is not a de Polignac number, because 999213210001 - 2¹⁵ = 999213177233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999213210011) 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, 779416840 + ... + 779418121.

It is an arithmetic number, because the mean of its divisors is an integer number (250193011401).

Almost surely, 2^999213210001 is an apocalyptic number.

It is an amenable number.

999213210001 is a deficient number, since it is larger than the sum of its proper divisors (1558835603).

999213210001 is a wasteful number, since it uses less digits than its factorization.

999213210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558835602.

The product of its (nonzero) digits is 8748, while the sum is 37.

The spelling of 999213210001 in words is "nine hundred ninety-nine billion, two hundred thirteen million, two hundred ten thousand, one".