21011011079 has 2 divisors, whose sum is σ = 21011011080. Its totient is φ = 21011011078.

The previous prime is 21011011069. The next prime is 21011011111. The reversal of 21011011079 is 97011011012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21011011079 - 2¹² = 21011006983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011011039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505505539 + 10505505540.

It is an arithmetic number, because the mean of its divisors is an integer number (10505505540).

Almost surely, 2^21011011079 is an apocalyptic number.

21011011079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011011079 is an equidigital number, since it uses as much as digits as its factorization.

21011011079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 23.

The spelling of 21011011079 in words is "twenty-one billion, eleven million, eleven thousand, seventy-nine".