21020012021222 has 64 divisors (see below), whose sum is σ = 34362595008000. Its totient is φ = 9603232722432.

The previous prime is 21020012021219. The next prime is 21020012021237. The reversal of 21020012021222 is 22212021002012.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21020012021222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1170435479 + ... + 1170453437.

It is an arithmetic number, because the mean of its divisors is an integer number (536915547000).

Almost surely, 2^{21020012021222} is an apocalyptic number.

21020012021222 is a deficient number, since it is larger than the sum of its proper divisors (13342582986778).

21020012021222 is a wasteful number, since it uses less digits than its factorization.

21020012021222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20013.

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

Adding to 21020012021222 its reverse (22212021002012), we get a palindrome (43232033023234).

The spelling of 21020012021222 in words is "twenty-one trillion, twenty billion, twelve million, twenty-one thousand, two hundred twenty-two".