21325940643 has 8 divisors (see below), whose sum is σ = 32496671488. Its totient is φ = 12186251784.

The previous prime is 21325940633. The next prime is 21325940659. The reversal of 21325940643 is 34604952312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21325940643 - 2¹³ = 21325932451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21325940633) 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, 507760471 + ... + 507760512.

It is an arithmetic number, because the mean of its divisors is an integer number (4062083936).

Almost surely, 2^21325940643 is an apocalyptic number.

21325940643 is a deficient number, since it is larger than the sum of its proper divisors (11170730845).

21325940643 is a wasteful number, since it uses less digits than its factorization.

21325940643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015520993.

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 21325940643 in words is "twenty-one billion, three hundred twenty-five million, nine hundred forty thousand, six hundred forty-three".