21021001002012 has 48 divisors (see below), whose sum is σ = 53616980317824. Its totient is φ = 6357026760000.

The previous prime is 21021001001977. The next prime is 21021001002031. The reversal of 21021001002012 is 21020010012012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162104239 + ... + 162233862.

It is an arithmetic number, because the mean of its divisors is an integer number (1117020423288).

Almost surely, 2^{21021001002012} is an apocalyptic number.

21021001002012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21021001002012 is an abundant number, since it is smaller than the sum of its proper divisors (32595979315812).

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

21021001002012 is a wasteful number, since it uses less digits than its factorization.

21021001002012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324338610 (or 324338608 counting only the distinct ones).

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

Adding to 21021001002012 its reverse (21020010012012), we get a palindrome (42041011014024).

The spelling of 21021001002012 in words is "twenty-one trillion, twenty-one billion, one million, two thousand, twelve".