21123044213 has 8 divisors (see below), whose sum is σ = 21806916096. Its totient is φ = 20439327600.

The previous prime is 21123044209. The next prime is 21123044251. The reversal of 21123044213 is 31244032112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21123044213 - 2² = 21123044209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123044263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279128 + ... + 346638.

It is an arithmetic number, because the mean of its divisors is an integer number (2725864512).

Almost surely, 2^21123044213 is an apocalyptic number.

It is an amenable number.

21123044213 is a deficient number, since it is larger than the sum of its proper divisors (683871883).

21123044213 is a wasteful number, since it uses less digits than its factorization.

21123044213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77635.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 21123044213 its reverse (31244032112), we get a palindrome (52367076325).

The spelling of 21123044213 in words is "twenty-one billion, one hundred twenty-three million, forty-four thousand, two hundred thirteen".