21010647235 has 8 divisors (see below), whose sum is σ = 25640112240. Its totient is φ = 16523627424.

The previous prime is 21010647221. The next prime is 21010647289. The reversal of 21010647235 is 53274601012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010647235 is a prime.

It is a super-2 number, since 2×21010647235² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21010647197 and 21010647206.

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, 35610972 + ... + 35611561.

It is an arithmetic number, because the mean of its divisors is an integer number (3205014030).

Almost surely, 2^21010647235 is an apocalyptic number.

21010647235 is a deficient number, since it is larger than the sum of its proper divisors (4629465005).

21010647235 is an equidigital number, since it uses as much as digits as its factorization.

21010647235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71222597.

The product of its (nonzero) digits is 10080, while the sum is 31.

The spelling of 21010647235 in words is "twenty-one billion, ten million, six hundred forty-seven thousand, two hundred thirty-five".