21949472213 has 8 divisors (see below), whose sum is σ = 22126131456. Its totient is φ = 21772951200.

The previous prime is 21949472203. The next prime is 21949472269. The reversal of 21949472213 is 31227494912.

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 21949472213 - 2¹⁰ = 21949471189 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 (21949472203) 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, 297020 + ... + 363482.

It is an arithmetic number, because the mean of its divisors is an integer number (2765766432).

Almost surely, 2^21949472213 is an apocalyptic number.

It is an amenable number.

21949472213 is a deficient number, since it is larger than the sum of its proper divisors (176659243).

21949472213 is a wasteful number, since it uses less digits than its factorization.

21949472213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69115.

The product of its digits is 217728, while the sum is 44.

The spelling of 21949472213 in words is "twenty-one billion, nine hundred forty-nine million, four hundred seventy-two thousand, two hundred thirteen".