21012211002 has 16 divisors (see below), whose sum is σ = 42409968480. Its totient is φ = 6939812592.

The previous prime is 21012210997. The next prime is 21012211007. The reversal of 21012211002 is 20011221012.

It is an interprime number because it is at equal distance from previous prime (21012210997) and next prime (21012211007).

It is a super-2 number, since 2×21012211002² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21012211007) 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, 16063728 + ... + 16065035.

It is an arithmetic number, because the mean of its divisors is an integer number (2650623030).

Almost surely, 2^21012211002 is an apocalyptic number.

21012211002 is an abundant number, since it is smaller than the sum of its proper divisors (21397757478).

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

21012211002 is a wasteful number, since it uses less digits than its factorization.

21012211002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32128877.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21012211002 its reverse (20011221012), we get a palindrome (41023432014).

The spelling of 21012211002 in words is "twenty-one billion, twelve million, two hundred eleven thousand, two".