21224522542212 has 72 divisors (see below), whose sum is σ = 58559479261920. Its totient is φ = 6428239384320.

The previous prime is 21224522542129. The next prime is 21224522542243.

21224522542212 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 4 + 5 + 225 + 422 + 1 + 2 = 666.

21224522542212 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13566162 + ... + 15049577.

It is an arithmetic number, because the mean of its divisors is an integer number (813326100860).

Almost surely, 2^{21224522542212} is an apocalyptic number.

21224522542212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21224522542212 is an abundant number, since it is smaller than the sum of its proper divisors (37334956719708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21224522542212 is a wasteful number, since it uses less digits than its factorization.

21224522542212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28617633 (or 28617628 counting only the distinct ones).

The product of its digits is 102400, while the sum is 36.

It can be divided in two parts, 2122452 and 2542212, that added together give a palindrome (4664664).

The spelling of 21224522542212 in words is "twenty-one trillion, two hundred twenty-four billion, five hundred twenty-two million, five hundred forty-two thousand, two hundred twelve".