21153221562 has 16 divisors (see below), whose sum is σ = 46152483552. Its totient is φ = 6410067120.

The previous prime is 21153221543. The next prime is 21153221591. The reversal of 21153221562 is 26512235112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160251613 + ... + 160251744.

It is an arithmetic number, because the mean of its divisors is an integer number (2884530222).

Almost surely, 2^21153221562 is an apocalyptic number.

21153221562 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21153221562 is an abundant number, since it is smaller than the sum of its proper divisors (24999261990).

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

21153221562 is a wasteful number, since it uses less digits than its factorization.

21153221562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320503373.

The product of its digits is 7200, while the sum is 30.

Adding to 21153221562 its reverse (26512235112), we get a palindrome (47665456674).

The spelling of 21153221562 in words is "twenty-one billion, one hundred fifty-three million, two hundred twenty-one thousand, five hundred sixty-two".