21273724210 has 32 divisors (see below), whose sum is σ = 39232657152. Its totient is φ = 8301770880.

The previous prime is 21273724189. The next prime is 21273724237. The reversal of 21273724210 is 1242737212.

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, 74805 + ... + 219415.

It is an arithmetic number, because the mean of its divisors is an integer number (1226020536).

Almost surely, 2^21273724210 is an apocalyptic number.

21273724210 is a deficient number, since it is larger than the sum of its proper divisors (17958932942).

21273724210 is a wasteful number, since it uses less digits than its factorization.

21273724210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144978.

The product of its (nonzero) digits is 9408, while the sum is 31.

The spelling of 21273724210 in words is "twenty-one billion, two hundred seventy-three million, seven hundred twenty-four thousand, two hundred ten".