83621021 has 8 divisors (see below), whose sum is σ = 91404288. Its totient is φ = 75868000.

The previous prime is 83620993. The next prime is 83621029. The reversal of 83621021 is 12012638.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83621021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83621029) 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, 1565 + ... + 13026.

It is an arithmetic number, because the mean of its divisors is an integer number (11425536).

Almost surely, 2^83621021 is an apocalyptic number.

It is an amenable number.

83621021 is a deficient number, since it is larger than the sum of its proper divisors (7783267).

83621021 is a wasteful number, since it uses less digits than its factorization.

83621021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15123.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 83621021 is about 9144.4530180870. The cubic root of 83621021 is about 437.2922917166.

Adding to 83621021 its reverse (12012638), we get a palindrome (95633659).

It can be divided in two parts, 836 and 21021, that multiplied together give a triangular number (17573556 = T₅₉₂₈).

The spelling of 83621021 in words is "eighty-three million, six hundred twenty-one thousand, twenty-one".