21220230454 has 16 divisors (see below), whose sum is σ = 32694524208. Its totient is φ = 10322124192.

The previous prime is 21220230413. The next prime is 21220230463. The reversal of 21220230454 is 45403202212.

It is a super-2 number, since 2×21220230454² (a number of 21 digits) contains 22 as substring.

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, 1079764 + ... + 1099240.

It is an arithmetic number, because the mean of its divisors is an integer number (2043407763).

Almost surely, 2^21220230454 is an apocalyptic number.

21220230454 is a deficient number, since it is larger than the sum of its proper divisors (11474293754).

21220230454 is a wasteful number, since it uses less digits than its factorization.

21220230454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34239.

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 21220230454 its reverse (45403202212), we get a palindrome (66623432666).

The spelling of 21220230454 in words is "twenty-one billion, two hundred twenty million, two hundred thirty thousand, four hundred fifty-four".