21310437731 has 8 divisors (see below), whose sum is σ = 23251481328. Its totient is φ = 19370016000.

The previous prime is 21310437689. The next prime is 21310437853. The reversal of 21310437731 is 13773401312.

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

It is a cyclic number.

It is not a de Polignac number, because 21310437731 - 2¹⁴ = 21310421347 is a prime.

It is a super-2 number, since 2×21310437731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310437131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82310 + ... + 222251.

It is an arithmetic number, because the mean of its divisors is an integer number (2906435166).

Almost surely, 2^21310437731 is an apocalyptic number.

21310437731 is a deficient number, since it is larger than the sum of its proper divisors (1941043597).

21310437731 is a wasteful number, since it uses less digits than its factorization.

21310437731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310933.

The product of its (nonzero) digits is 10584, while the sum is 32.

The spelling of 21310437731 in words is "twenty-one billion, three hundred ten million, four hundred thirty-seven thousand, seven hundred thirty-one".