21423023214 has 16 divisors (see below), whose sum is σ = 43327463760. Its totient is φ = 7060771520.

The previous prime is 21423023207. The next prime is 21423023221. The reversal of 21423023214 is 41232032412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21423023207) and next prime (21423023221).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20058477 + ... + 20059544.

It is an arithmetic number, because the mean of its divisors is an integer number (2707966485).

Almost surely, 2^21423023214 is an apocalyptic number.

21423023214 is an abundant number, since it is smaller than the sum of its proper divisors (21904440546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21423023214 is a wasteful number, since it uses less digits than its factorization.

21423023214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40118115.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21423023214 its reverse (41232032412), we get a palindrome (62655055626).

The spelling of 21423023214 in words is "twenty-one billion, four hundred twenty-three million, twenty-three thousand, two hundred fourteen".