21022020212012 has 24 divisors (see below), whose sum is σ = 38952859176000. Its totient is φ = 9892641155840.

The previous prime is 21022020211957. The next prime is 21022020212143. The reversal of 21022020212012 is 21021202022012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 8562989 + ... + 10740987.

It is an arithmetic number, because the mean of its divisors is an integer number (1623035799000).

Almost surely, 2^{21022020212012} is an apocalyptic number.

It is an amenable number.

21022020212012 is a deficient number, since it is larger than the sum of its proper divisors (17930838963988).

21022020212012 is a wasteful number, since it uses less digits than its factorization.

21022020212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2319961 (or 2319959 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21022020212012 its reverse (21021202022012), we get a palindrome (42043222234024).

The spelling of 21022020212012 in words is "twenty-one trillion, twenty-two billion, twenty million, two hundred twelve thousand, twelve".