21001211211002 has 16 divisors (see below), whose sum is σ = 34487051635872. Its totient is φ = 9512273626320.

The previous prime is 21001211210851. The next prime is 21001211211023. The reversal of 21001211211002 is 20011211210012.

It is a super-3 number, since 3×21001211211002³ (a number of 41 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1686567113 + ... + 1686579564.

It is an arithmetic number, because the mean of its divisors is an integer number (2155440727242).

Almost surely, 2^{21001211211002} is an apocalyptic number.

21001211211002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21001211211002 is a deficient number, since it is larger than the sum of its proper divisors (13485840424870).

21001211211002 is a wasteful number, since it uses less digits than its factorization.

21001211211002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373146973.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21001211211002 its reverse (20011211210012), we get a palindrome (41012422421014).

The spelling of 21001211211002 in words is "twenty-one trillion, one billion, two hundred eleven million, two hundred eleven thousand, two".