20021221210022 has 16 divisors (see below), whose sum is σ = 31613655518640. Its totient is φ = 9483376069728.

The previous prime is 20021221209971. The next prime is 20021221210153. The reversal of 20021221210022 is 22001212212002.

It is a happy number.

It is a congruent number.

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, 8993393 + ... + 10996524.

It is an arithmetic number, because the mean of its divisors is an integer number (1975853469915).

Almost surely, 2^{20021221210022} is an apocalyptic number.

20021221210022 is a deficient number, since it is larger than the sum of its proper divisors (11592434308618).

20021221210022 is a wasteful number, since it uses less digits than its factorization.

20021221210022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20016295.

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

Adding to 20021221210022 its reverse (22001212212002), we get a palindrome (42022433422024).

The spelling of 20021221210022 in words is "twenty trillion, twenty-one billion, two hundred twenty-one million, two hundred ten thousand, twenty-two".