21551544401322 has 32 divisors (see below), whose sum is σ = 46464534200448. Its totient is φ = 6624698262336.

The previous prime is 21551544401273. The next prime is 21551544401383. The reversal of 21551544401322 is 22310444515512.

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

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, 136298998 + ... + 136457025.

It is an arithmetic number, because the mean of its divisors is an integer number (1452016693764).

Almost surely, 2^{21551544401322} is an apocalyptic number.

21551544401322 is an abundant number, since it is smaller than the sum of its proper divisors (24912989799126).

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

21551544401322 is a wasteful number, since it uses less digits than its factorization.

21551544401322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272757054.

The product of its (nonzero) digits is 192000, while the sum is 39.

Adding to 21551544401322 its reverse (22310444515512), we get a palindrome (43861988916834).

The spelling of 21551544401322 in words is "twenty-one trillion, five hundred fifty-one billion, five hundred forty-four million, four hundred one thousand, three hundred twenty-two".