21612223046 has 16 divisors (see below), whose sum is σ = 34413556320. Its totient is φ = 10144306560.

The previous prime is 21612223019. The next prime is 21612223049. The reversal of 21612223046 is 64032221612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612223049) 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, 803810 + ... + 830261.

It is an arithmetic number, because the mean of its divisors is an integer number (2150847270).

Almost surely, 2^21612223046 is an apocalyptic number.

21612223046 is a deficient number, since it is larger than the sum of its proper divisors (12801333274).

21612223046 is a wasteful number, since it uses less digits than its factorization.

21612223046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634479.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 21612223046 its reverse (64032221612), we get a palindrome (85644444658).

The spelling of 21612223046 in words is "twenty-one billion, six hundred twelve million, two hundred twenty-three thousand, forty-six".