21443152621 has 8 divisors (see below), whose sum is σ = 23461948224. Its totient is φ = 19435926720.

The previous prime is 21443152603. The next prime is 21443152651. The reversal of 21443152621 is 12625134412.

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 21443152621 - 2⁹ = 21443152109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443152651) 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, 2888545 + ... + 2895958.

It is an arithmetic number, because the mean of its divisors is an integer number (2932743528).

Almost surely, 2^21443152621 is an apocalyptic number.

It is an amenable number.

21443152621 is a deficient number, since it is larger than the sum of its proper divisors (2018795603).

21443152621 is a wasteful number, since it uses less digits than its factorization.

21443152621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5784851.

The product of its digits is 11520, while the sum is 31.

The spelling of 21443152621 in words is "twenty-one billion, four hundred forty-three million, one hundred fifty-two thousand, six hundred twenty-one".