11421020731 has 2 divisors, whose sum is σ = 11421020732. Its totient is φ = 11421020730.

The previous prime is 11421020701. The next prime is 11421020771. The reversal of 11421020731 is 13702012411.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11421020731 - 2¹⁹ = 11420496443 is a prime.

It is a super-2 number, since 2×11421020731² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11421020701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5710510365 + 5710510366.

It is an arithmetic number, because the mean of its divisors is an integer number (5710510366).

Almost surely, 2^11421020731 is an apocalyptic number.

11421020731 is a deficient number, since it is larger than the sum of its proper divisors (1).

11421020731 is an equidigital number, since it uses as much as digits as its factorization.

11421020731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The spelling of 11421020731 in words is "eleven billion, four hundred twenty-one million, twenty thousand, seven hundred thirty-one".