55421221353402 has 16 divisors (see below), whose sum is σ = 110842645537152. Its totient is φ = 18473706646080.

The previous prime is 55421221353371. The next prime is 55421221353479. The reversal of 55421221353402 is 20435312212455.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4776223 + ... + 11560914.

It is an arithmetic number, because the mean of its divisors is an integer number (6927665346072).

Almost surely, 2^{55421221353402} is an apocalyptic number.

55421221353402 is an abundant number, since it is smaller than the sum of its proper divisors (55421424183750).

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

55421221353402 is a wasteful number, since it uses less digits than its factorization.

55421221353402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16902533.

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

Adding to 55421221353402 its reverse (20435312212455), we get a palindrome (75856533565857).

The spelling of 55421221353402 in words is "fifty-five trillion, four hundred twenty-one billion, two hundred twenty-one million, three hundred fifty-three thousand, four hundred two".