21212056117741 has 32 divisors (see below), whose sum is σ = 23430638486016. Its totient is φ = 19144296864000.

The previous prime is 21212056117723. The next prime is 21212056117817. The reversal of 21212056117741 is 14771165021212.

It is a happy number.

It is not a de Polignac number, because 21212056117741 - 2⁷ = 21212056117613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21212056117694 and 21212056117703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212056117141) 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, 808051 + ... + 6563311.

It is an arithmetic number, because the mean of its divisors is an integer number (732207452688).

Almost surely, 2^{21212056117741} is an apocalyptic number.

It is an amenable number.

21212056117741 is a deficient number, since it is larger than the sum of its proper divisors (2218582368275).

21212056117741 is a wasteful number, since it uses less digits than its factorization.

21212056117741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5755453.

The product of its (nonzero) digits is 47040, while the sum is 40.

The spelling of 21212056117741 in words is "twenty-one trillion, two hundred twelve billion, fifty-six million, one hundred seventeen thousand, seven hundred forty-one".