21220404153 has 64 divisors (see below), whose sum is σ = 32486952960. Its totient is φ = 12230668800.

The previous prime is 21220404151. The next prime is 21220404181. The reversal of 21220404153 is 35140402212.

It is not a de Polignac number, because 21220404153 - 2¹ = 21220404151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220404151) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4054048 + ... + 4059278.

It is an arithmetic number, because the mean of its divisors is an integer number (507608640).

Almost surely, 2^21220404153 is an apocalyptic number.

It is an amenable number.

21220404153 is a deficient number, since it is larger than the sum of its proper divisors (11266548807).

21220404153 is a wasteful number, since it uses less digits than its factorization.

21220404153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5390.

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21220404153 its reverse (35140402212), we get a palindrome (56360806365).

The spelling of 21220404153 in words is "twenty-one billion, two hundred twenty million, four hundred four thousand, one hundred fifty-three".