21224151445 has 16 divisors (see below), whose sum is σ = 29407488768. Its totient is φ = 14403663360.

The previous prime is 21224151407. The next prime is 21224151451. The reversal of 21224151445 is 54415142212.

It is not a de Polignac number, because 21224151445 - 2¹⁷ = 21224020373 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3122401 + ... + 3129190.

It is an arithmetic number, because the mean of its divisors is an integer number (1837968048).

Almost surely, 2^21224151445 is an apocalyptic number.

It is an amenable number.

21224151445 is a deficient number, since it is larger than the sum of its proper divisors (8183337323).

21224151445 is an equidigital number, since it uses as much as digits as its factorization.

21224151445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6251700.

The product of its digits is 12800, while the sum is 31.

Adding to 21224151445 its reverse (54415142212), we get a palindrome (75639293657).

The spelling of 21224151445 in words is "twenty-one billion, two hundred twenty-four million, one hundred fifty-one thousand, four hundred forty-five".