221021020012 has 12 divisors (see below), whose sum is σ = 416539614736. Its totient is φ = 102009701520.

The previous prime is 221021020009. The next prime is 221021020021. The reversal of 221021020012 is 210020120122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 221021019974 and 221021020001.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2125202064 + ... + 2125202167.

Almost surely, 2^221021020012 is an apocalyptic number.

It is an amenable number.

221021020012 is a deficient number, since it is larger than the sum of its proper divisors (195518594724).

221021020012 is a wasteful number, since it uses less digits than its factorization.

221021020012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4250404248 (or 4250404246 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221021020012 its reverse (210020120122), we get a palindrome (431041140134).

The spelling of 221021020012 in words is "two hundred twenty-one billion, twenty-one million, twenty thousand, twelve".