21303153731 has 4 divisors (see below), whose sum is σ = 21353997000. Its totient is φ = 21252310464.

The previous prime is 21303153721. The next prime is 21303153733. The reversal of 21303153731 is 13735130312.

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

It is a cyclic number.

It is not a de Polignac number, because 21303153731 - 2³⁴ = 4123284547 is a prime.

It is a super-2 number, since 2×21303153731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21303153694 and 21303153703.

It is not an unprimeable number, because it can be changed into a prime (21303153733) 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, 25421006 + ... + 25421843.

It is an arithmetic number, because the mean of its divisors is an integer number (5338499250).

Almost surely, 2^21303153731 is an apocalyptic number.

21303153731 is a deficient number, since it is larger than the sum of its proper divisors (50843269).

21303153731 is an equidigital number, since it uses as much as digits as its factorization.

21303153731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50843268.

The product of its (nonzero) digits is 5670, while the sum is 29.

The spelling of 21303153731 in words is "twenty-one billion, three hundred three million, one hundred fifty-three thousand, seven hundred thirty-one".