22121001000021 has 32 divisors (see below), whose sum is σ = 37116242039808. Its totient is φ = 11384032544640.

The previous prime is 22121001000019. The next prime is 22121001000047. The reversal of 22121001000021 is 12000010012122.

It is not a de Polignac number, because 22121001000021 - 2¹ = 22121001000019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22121000999970 and 22121001000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121001000821) 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, 447460840 + ... + 447510273.

It is an arithmetic number, because the mean of its divisors is an integer number (1159882563744).

Almost surely, 2^{22121001000021} is an apocalyptic number.

22121001000021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22121001000021 is a deficient number, since it is larger than the sum of its proper divisors (14995241039787).

22121001000021 is a wasteful number, since it uses less digits than its factorization.

22121001000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894971241.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 22121001000021 its reverse (12000010012122), we get a palindrome (34121011012143).

The spelling of 22121001000021 in words is "twenty-two trillion, one hundred twenty-one billion, one million, twenty-one", and thus it is an aban number.