21221008870 has 8 divisors (see below), whose sum is σ = 38197815984. Its totient is φ = 8488403544.

The previous prime is 21221008859. The next prime is 21221008877. The reversal of 21221008870 is 7880012212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221008877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061050434 + ... + 1061050453.

It is an arithmetic number, because the mean of its divisors is an integer number (4774726998).

Almost surely, 2^21221008870 is an apocalyptic number.

21221008870 is a deficient number, since it is larger than the sum of its proper divisors (16976807114).

21221008870 is a wasteful number, since it uses less digits than its factorization.

21221008870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122100894.

The product of its (nonzero) digits is 3584, while the sum is 31.

The spelling of 21221008870 in words is "twenty-one billion, two hundred twenty-one million, eight thousand, eight hundred seventy".