222121001001021 has 16 divisors (see below), whose sum is σ = 296741417697984. Its totient is φ = 147790907282304.

The previous prime is 222121001000959. The next prime is 222121001001047. The reversal of 222121001001021 is 120100100121222.

It is not a de Polignac number, because 222121001001021 - 2¹⁸ = 222121000738877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222121001001821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32025126 + ... + 38338631.

It is an arithmetic number, because the mean of its divisors is an integer number (18546338606124).

Almost surely, 2^{222121001001021} is an apocalyptic number.

It is an amenable number.

222121001001021 is a deficient number, since it is larger than the sum of its proper divisors (74620416696963).

222121001001021 is a wasteful number, since it uses less digits than its factorization.

222121001001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70365820.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 222121001001021 its reverse (120100100121222), we get a palindrome (342221101122243).

The spelling of 222121001001021 in words is "two hundred twenty-two trillion, one hundred twenty-one billion, one million, one thousand, twenty-one".