21350427331 has 4 divisors (see below), whose sum is σ = 21486417472. Its totient is φ = 21214437192.

The previous prime is 21350427283. The next prime is 21350427337. The reversal of 21350427331 is 13372405312.

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-21350427331 is a prime.

It is a super-2 number, since 2×21350427331² (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 = 21350427293 and 21350427302.

It is not an unprimeable number, because it can be changed into a prime (21350427337) 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, 67994835 + ... + 67995148.

It is an arithmetic number, because the mean of its divisors is an integer number (5371604368).

Almost surely, 2^21350427331 is an apocalyptic number.

21350427331 is a deficient number, since it is larger than the sum of its proper divisors (135990141).

21350427331 is a wasteful number, since it uses less digits than its factorization.

21350427331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135990140.

The product of its (nonzero) digits is 15120, while the sum is 31.

The spelling of 21350427331 in words is "twenty-one billion, three hundred fifty million, four hundred twenty-seven thousand, three hundred thirty-one".