21153445220622 has 128 divisors (see below), whose sum is σ = 53176851463680. Its totient is φ = 5513728320000.

The previous prime is 21153445220617. The next prime is 21153445220659. The reversal of 21153445220622 is 22602254435112.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9641629 + ... + 11630472.

It is an arithmetic number, because the mean of its divisors is an integer number (415444152060).

Almost surely, 2^{21153445220622} is an apocalyptic number.

21153445220622 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21153445220622 is an abundant number, since it is smaller than the sum of its proper divisors (32023406243058).

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

21153445220622 is a wasteful number, since it uses less digits than its factorization.

21153445220622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21272210.

The product of its (nonzero) digits is 230400, while the sum is 39.

Adding to 21153445220622 its reverse (22602254435112), we get a palindrome (43755699655734).

The spelling of 21153445220622 in words is "twenty-one trillion, one hundred fifty-three billion, four hundred forty-five million, two hundred twenty thousand, six hundred twenty-two".