21739130432921 has 8 divisors (see below), whose sum is σ = 23763715257888. Its totient is φ = 19722595648000.

The previous prime is 21739130432917. The next prime is 21739130432923. The reversal of 21739130432921 is 12923403193712.

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 21739130432921 - 2² = 21739130432917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21739130432923) 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, 2012504360 + ... + 2012515161.

It is an arithmetic number, because the mean of its divisors is an integer number (2970464407236).

Almost surely, 2^{21739130432921} is an apocalyptic number.

It is an amenable number.

21739130432921 is a deficient number, since it is larger than the sum of its proper divisors (2024584824967).

21739130432921 is a wasteful number, since it uses less digits than its factorization.

21739130432921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4025020023.

The product of its (nonzero) digits is 489888, while the sum is 47.

The spelling of 21739130432921 in words is "twenty-one trillion, seven hundred thirty-nine billion, one hundred thirty million, four hundred thirty-two thousand, nine hundred twenty-one".