21220021002 has 16 divisors (see below), whose sum is σ = 42449211072. Its totient is φ = 7071812160.

The previous prime is 21220021001. The next prime is 21220021003. The reversal of 21220021002 is 20012002212.

It is an interprime number because it is at equal distance from previous prime (21220021001) and next prime (21220021003).

It is not an unprimeable number, because it can be changed into a prime (21220021001) 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, 351774 + ... + 407657.

It is an arithmetic number, because the mean of its divisors is an integer number (2653075692).

Almost surely, 2^21220021002 is an apocalyptic number.

21220021002 is an abundant number, since it is smaller than the sum of its proper divisors (21229190070).

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

21220021002 is a wasteful number, since it uses less digits than its factorization.

21220021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764093.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21220021002 its reverse (20012002212), we get a palindrome (41232023214).

The spelling of 21220021002 in words is "twenty-one billion, two hundred twenty million, twenty-one thousand, two".