21152211052620 has 48 divisors (see below), whose sum is σ = 59347805384448. Its totient is φ = 5629007286720.

The previous prime is 21152211052619. The next prime is 21152211052699. The reversal of 21152211052620 is 2625011225112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361918266 + ... + 361976705.

It is an arithmetic number, because the mean of its divisors is an integer number (1236412612176).

Almost surely, 2^{21152211052620} is an apocalyptic number.

21152211052620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21152211052620 is an abundant number, since it is smaller than the sum of its proper divisors (38195594331828).

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

21152211052620 is a wasteful number, since it uses less digits than its factorization.

21152211052620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723895470 (or 723895468 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

Adding to 21152211052620 its reverse (2625011225112), we get a palindrome (23777222277732).

The spelling of 21152211052620 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred eleven million, fifty-two thousand, six hundred twenty".