20101246243 has 4 divisors (see below), whose sum is σ = 21647495968. Its totient is φ = 18554996520.

The previous prime is 20101246223. The next prime is 20101246303. The reversal of 20101246243 is 34264210102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20101246243 - 2¹³ = 20101238051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20101246223) 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, 773124843 + ... + 773124868.

It is an arithmetic number, because the mean of its divisors is an integer number (5411873992).

Almost surely, 2^20101246243 is an apocalyptic number.

20101246243 is a deficient number, since it is larger than the sum of its proper divisors (1546249725).

20101246243 is a wasteful number, since it uses less digits than its factorization.

20101246243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546249724.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 20101246243 its reverse (34264210102), we get a palindrome (54365456345).

The spelling of 20101246243 in words is "twenty billion, one hundred one million, two hundred forty-six thousand, two hundred forty-three".