55721432210 has 16 divisors (see below), whose sum is σ = 100304982936. Its totient is φ = 22287149568.

The previous prime is 55721432209. The next prime is 55721432233. The reversal of 55721432210 is 1223412755.

It can be written as a sum of positive squares in 4 ways, for example, as 49975943809 + 5745488401 = 223553^2 + 75799^2 .

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, 5537 + ... + 333876.

Almost surely, 2^55721432210 is an apocalyptic number.

55721432210 is a deficient number, since it is larger than the sum of its proper divisors (44583550726).

55721432210 is a wasteful number, since it uses less digits than its factorization.

55721432210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355837.

The product of its (nonzero) digits is 16800, while the sum is 32.

Adding to 55721432210 its reverse (1223412755), we get a palindrome (56944844965).

The spelling of 55721432210 in words is "fifty-five billion, seven hundred twenty-one million, four hundred thirty-two thousand, two hundred ten".