52021221111 has 32 divisors (see below), whose sum is σ = 79263152640. Its totient is φ = 33699960000.

The previous prime is 52021221073. The next prime is 52021221137. The reversal of 52021221111 is 11112212025.

52021221111 is a `hidden beast` number, since 520 + 2 + 12 + 21 + 111 = 666.

It is not a de Polignac number, because 52021221111 - 2⁹ = 52021220599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52021221151) 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, 184246 + ... + 371468.

It is an arithmetic number, because the mean of its divisors is an integer number (2476973520).

Almost surely, 2^52021221111 is an apocalyptic number.

52021221111 is a deficient number, since it is larger than the sum of its proper divisors (27241931529).

52021221111 is a wasteful number, since it uses less digits than its factorization.

52021221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187524 (or 187518 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 52021221111 its reverse (11112212025), we get a palindrome (63133433136).

The spelling of 52021221111 in words is "fifty-two billion, twenty-one million, two hundred twenty-one thousand, one hundred eleven".