20021211545250 has 32 divisors (see below), whose sum is σ = 49972944018816. Its totient is φ = 5338989745200.

The previous prime is 20021211545233. The next prime is 20021211545263. The reversal of 20021211545250 is 5254511212002.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13347473614 + ... + 13347475113.

It is an arithmetic number, because the mean of its divisors is an integer number (1561654500588).

Almost surely, 2^{20021211545250} is an apocalyptic number.

20021211545250 is an abundant number, since it is smaller than the sum of its proper divisors (29951732473566).

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

20021211545250 is a wasteful number, since it uses less digits than its factorization.

20021211545250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26694948747 (or 26694948737 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

Adding to 20021211545250 its reverse (5254511212002), we get a palindrome (25275722757252).

The spelling of 20021211545250 in words is "twenty trillion, twenty-one billion, two hundred eleven million, five hundred forty-five thousand, two hundred fifty".