21051552435 has 16 divisors (see below), whose sum is σ = 33742324224. Its totient is φ = 11207547872.

The previous prime is 21051552419. The next prime is 21051552439. The reversal of 21051552435 is 53425515012.

It is a cyclic number.

It is not a de Polignac number, because 21051552435 - 2⁴ = 21051552419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21051552396 and 21051552405.

It is not an unprimeable number, because it can be changed into a prime (21051552439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1237947 + ... + 1254836.

It is an arithmetic number, because the mean of its divisors is an integer number (2108895264).

Almost surely, 2^21051552435 is an apocalyptic number.

21051552435 is a deficient number, since it is larger than the sum of its proper divisors (12690771789).

21051552435 is a wasteful number, since it uses less digits than its factorization.

21051552435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2493354.

The product of its (nonzero) digits is 30000, while the sum is 33.

The spelling of 21051552435 in words is "twenty-one billion, fifty-one million, five hundred fifty-two thousand, four hundred thirty-five".