21432221210 has 32 divisors (see below), whose sum is σ = 39001398912. Its totient is φ = 8478980800.

The previous prime is 21432221131. The next prime is 21432221257. The reversal of 21432221210 is 1212223412.

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, 982037 + ... + 1003623.

It is an arithmetic number, because the mean of its divisors is an integer number (1218793716).

Almost surely, 2^21432221210 is an apocalyptic number.

21432221210 is a deficient number, since it is larger than the sum of its proper divisors (17569177702).

21432221210 is a wasteful number, since it uses less digits than its factorization.

21432221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22678.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21432221210 its reverse (1212223412), we get a palindrome (22644444622).

It can be divided in two parts, 214322 and 21210, that added together give a palindrome (235532).

The spelling of 21432221210 in words is "twenty-one billion, four hundred thirty-two million, two hundred twenty-one thousand, two hundred ten".