20211220221002 has 8 divisors (see below), whose sum is σ = 30334124592516. Its totient is φ = 10099845356832.

The previous prime is 20211220220969. The next prime is 20211220221029. The reversal of 20211220221002 is 20012202211202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20134595891281 + 76624329721 = 4487159^2 + 276811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 2882372453 + ... + 2882379464.

Almost surely, 2^{20211220221002} is an apocalyptic number.

20211220221002 is a deficient number, since it is larger than the sum of its proper divisors (10122904371514).

20211220221002 is a wasteful number, since it uses less digits than its factorization.

20211220221002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5764753672.

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

Adding to 20211220221002 its reverse (20012202211202), we get a palindrome (40223422432204).

The spelling of 20211220221002 in words is "twenty trillion, two hundred eleven billion, two hundred twenty million, two hundred twenty-one thousand, two".