6621021402 has 8 divisors (see below), whose sum is σ = 13242042816. Its totient is φ = 2207007132.

The previous prime is 6621021401. The next prime is 6621021439. The reversal of 6621021402 is 2041201266.

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

6621021402 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (6621021401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 551751778 + ... + 551751789.

It is an arithmetic number, because the mean of its divisors is an integer number (1655255352).

Almost surely, 2^6621021402 is an apocalyptic number.

6621021402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6621021402 is a wasteful number, since it uses less digits than its factorization.

6621021402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103503572.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 6621021402 is about 81369.6589767955. The cubic root of 6621021402 is about 1877.7668332453.

Adding to 6621021402 its reverse (2041201266), we get a palindrome (8662222668).

The spelling of 6621021402 in words is "six billion, six hundred twenty-one million, twenty-one thousand, four hundred two".