20121767679 has 16 divisors (see below), whose sum is σ = 29044076544. Its totient is φ = 12317791200.

The previous prime is 20121767663. The next prime is 20121767713. The reversal of 20121767679 is 97676712102.

It is a happy number.

It is not a de Polignac number, because 20121767679 - 2⁴ = 20121767663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121767179) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1343187 + ... + 1358084.

It is an arithmetic number, because the mean of its divisors is an integer number (1815254784).

Almost surely, 2^20121767679 is an apocalyptic number.

20121767679 is a deficient number, since it is larger than the sum of its proper divisors (8922308865).

20121767679 is a wasteful number, since it uses less digits than its factorization.

20121767679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2701478.

The product of its (nonzero) digits is 444528, while the sum is 48.

The spelling of 20121767679 in words is "twenty billion, one hundred twenty-one million, seven hundred sixty-seven thousand, six hundred seventy-nine".