21220001210121 has 32 divisors (see below), whose sum is σ = 32699590318080. Its totient is φ = 11989092196224.

The previous prime is 21220001210101. The next prime is 21220001210143. The reversal of 21220001210121 is 12101210002212.

It is not a de Polignac number, because 21220001210121 - 2¹⁴ = 21220001193737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21220001210121.

It is not an unprimeable number, because it can be changed into a prime (21220001210101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65408316 + ... + 65731938.

It is an arithmetic number, because the mean of its divisors is an integer number (1021862197440).

Almost surely, 2^{21220001210121} is an apocalyptic number.

21220001210121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21220001210121 is a deficient number, since it is larger than the sum of its proper divisors (11479589107959).

21220001210121 is a wasteful number, since it uses less digits than its factorization.

21220001210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358805.

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

Adding to 21220001210121 its reverse (12101210002212), we get a palindrome (33321211212333).

The spelling of 21220001210121 in words is "twenty-one trillion, two hundred twenty billion, one million, two hundred ten thousand, one hundred twenty-one".