21640454237210 has 8 divisors (see below), whose sum is σ = 38952817626996. Its totient is φ = 8656181694880.

The previous prime is 21640454237177. The next prime is 21640454237323. The reversal of 21640454237210 is 1273245404612.

It can be written as a sum of positive squares in 2 ways, for example, as 21637298831281 + 3155405929 = 4651591^2 + 56173^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1082022711851 + ... + 1082022711870.

Almost surely, 2^{21640454237210} is an apocalyptic number.

21640454237210 is a deficient number, since it is larger than the sum of its proper divisors (17312363389786).

21640454237210 is a wasteful number, since it uses less digits than its factorization.

21640454237210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164045423728.

The product of its (nonzero) digits is 322560, while the sum is 41.

The spelling of 21640454237210 in words is "twenty-one trillion, six hundred forty billion, four hundred fifty-four million, two hundred thirty-seven thousand, two hundred ten".