1220121210021 has 32 divisors (see below), whose sum is σ = 1879332660480. Its totient is φ = 689695243776.

The previous prime is 1220121210019. The next prime is 1220121210053. The reversal of 1220121210021 is 1200121210221.

It is not a de Polignac number, because 1220121210021 - 2¹ = 1220121210019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220121210421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 980355 + ... + 1844271.

It is an arithmetic number, because the mean of its divisors is an integer number (58729145640).

Almost surely, 2^{1220121210021} is an apocalyptic number.

It is an amenable number.

1220121210021 is a deficient number, since it is larger than the sum of its proper divisors (659211450459).

1220121210021 is a wasteful number, since it uses less digits than its factorization.

1220121210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864653.

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

Adding to 1220121210021 its reverse (1200121210221), we get a palindrome (2420242420242).

The spelling of 1220121210021 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred ten thousand, twenty-one".