21155211311452 has 12 divisors (see below), whose sum is σ = 37023738950016. Its totient is φ = 10577000182880.

The previous prime is 21155211311441. The next prime is 21155211311477. The reversal of 21155211311452 is 25411311255112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151289593 + ... + 151429360.

It is an arithmetic number, because the mean of its divisors is an integer number (3085311579168).

Almost surely, 2^{21155211311452} is an apocalyptic number.

It is an amenable number.

21155211311452 is a deficient number, since it is larger than the sum of its proper divisors (15868527638564).

21155211311452 is a wasteful number, since it uses less digits than its factorization.

21155211311452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302736428 (or 302736426 counting only the distinct ones).

The product of its digits is 12000, while the sum is 34.

Adding to 21155211311452 its reverse (25411311255112), we get a palindrome (46566522566564).

The spelling of 21155211311452 in words is "twenty-one trillion, one hundred fifty-five billion, two hundred eleven million, three hundred eleven thousand, four hundred fifty-two".