21453221460 has 48 divisors (see below), whose sum is σ = 65529842112. Its totient is φ = 5200780800.

The previous prime is 21453221441. The next prime is 21453221483. The reversal of 21453221460 is 6412235412.

It is a super-2 number, since 2×21453221460² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 16251781 + ... + 16253100.

It is an arithmetic number, because the mean of its divisors is an integer number (1365205044).

Almost surely, 2^21453221460 is an apocalyptic number.

21453221460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21453221460 is an abundant number, since it is smaller than the sum of its proper divisors (44076620652).

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

21453221460 is a wasteful number, since it uses less digits than its factorization.

21453221460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32504904 (or 32504902 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 21453221460 its reverse (6412235412), we get a palindrome (27865456872).

The spelling of 21453221460 in words is "twenty-one billion, four hundred fifty-three million, two hundred twenty-one thousand, four hundred sixty".