21353154763 has 4 divisors (see below), whose sum is σ = 21354795288. Its totient is φ = 21351514240.

The previous prime is 21353154721. The next prime is 21353154799. The reversal of 21353154763 is 36745135312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21353154763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21353154463) 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, 800581 + ... + 826822.

It is an arithmetic number, because the mean of its divisors is an integer number (5338698822).

Almost surely, 2^21353154763 is an apocalyptic number.

21353154763 is a deficient number, since it is larger than the sum of its proper divisors (1640525).

21353154763 is a wasteful number, since it uses less digits than its factorization.

21353154763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640524.

The product of its digits is 226800, while the sum is 40.

The spelling of 21353154763 in words is "twenty-one billion, three hundred fifty-three million, one hundred fifty-four thousand, seven hundred sixty-three".