21001221201002 has 32 divisors (see below), whose sum is σ = 36054270046080. Its totient is φ = 8987485167360.

The previous prime is 21001221201001. The next prime is 21001221201041. The reversal of 21001221201002 is 20010212210012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (21001221201001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42599774 + ... + 43089942.

It is an arithmetic number, because the mean of its divisors is an integer number (1126695938940).

Almost surely, 2^{21001221201002} is an apocalyptic number.

21001221201002 is a deficient number, since it is larger than the sum of its proper divisors (15053048845078).

21001221201002 is a wasteful number, since it uses less digits than its factorization.

21001221201002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494606.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21001221201002 its reverse (20010212210012), we get a palindrome (41011433411014).

The spelling of 21001221201002 in words is "twenty-one trillion, one billion, two hundred twenty-one million, two hundred one thousand, two".