21553345222140 has 48 divisors (see below), whose sum is σ = 62973252131328. Its totient is φ = 5497664867904.

The previous prime is 21553345222109. The next prime is 21553345222177. The reversal of 21553345222140 is 4122254335512.

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, 7809181672 + ... + 7809184431.

It is an arithmetic number, because the mean of its divisors is an integer number (1311942752736).

Almost surely, 2^{21553345222140} is an apocalyptic number.

21553345222140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21553345222140 is an abundant number, since it is smaller than the sum of its proper divisors (41419906909188).

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

21553345222140 is a wasteful number, since it uses less digits than its factorization.

21553345222140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15618366138 (or 15618366136 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

Adding to 21553345222140 its reverse (4122254335512), we get a palindrome (25675599557652).

The spelling of 21553345222140 in words is "twenty-one trillion, five hundred fifty-three billion, three hundred forty-five million, two hundred twenty-two thousand, one hundred forty".