6739989099021 has 6 divisors (see below), whose sum is σ = 9735539809710. Its totient is φ = 4493326066008.

The previous prime is 6739989098993. The next prime is 6739989099029. The reversal of 6739989099021 is 1209909899376.

6739989099021 is a `hidden beast` number, since 67 + 399 + 8 + 90 + 9 + 90 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4836524624100 + 1903464474921 = 2199210^2 + 1379661^2 .

It is not a de Polignac number, because 6739989099021 - 2¹³ = 6739989090829 is a prime.

It is a super-2 number, since 2×6739989099021² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6739989099029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 374443838826 + ... + 374443838843.

It is an arithmetic number, because the mean of its divisors is an integer number (1622589968285).

Almost surely, 2^{6739989099021} is an apocalyptic number.

It is an amenable number.

6739989099021 is a deficient number, since it is larger than the sum of its proper divisors (2995550710689).

6739989099021 is a wasteful number, since it uses less digits than its factorization.

6739989099021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748887677675 (or 748887677672 counting only the distinct ones).

The product of its (nonzero) digits is 119042784, while the sum is 72.

The spelling of 6739989099021 in words is "six trillion, seven hundred thirty-nine billion, nine hundred eighty-nine million, ninety-nine thousand, twenty-one".