21111151015152 has 240 divisors, whose sum is σ = 68258412039168. Its totient is φ = 6019763742720.

The previous prime is 21111151015147. The next prime is 21111151015219. The reversal of 21111151015152 is 25151015111112.

It is a happy number.

21111151015152 is a `hidden beast` number, since 2 + 11 + 111 + 510 + 15 + 15 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 134642433 + ... + 134799135.

Almost surely, 2^{21111151015152} is an apocalyptic number.

21111151015152 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111151015152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34129206019584).

21111151015152 is an abundant number, since it is smaller than the sum of its proper divisors (47147261024016).

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

21111151015152 is a wasteful number, since it uses less digits than its factorization.

21111151015152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161748 (or 161739 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 27.

Adding to 21111151015152 its reverse (25151015111112), we get a palindrome (46262166126264).

The spelling of 21111151015152 in words is "twenty-one trillion, one hundred eleven billion, one hundred fifty-one million, fifteen thousand, one hundred fifty-two".