21155152610412 has 24 divisors (see below), whose sum is σ = 54846691953200. Its totient is φ = 7051717536768.

The previous prime is 21155152610381. The next prime is 21155152610429. The reversal of 21155152610412 is 21401625155112.

21155152610412 is a `hidden beast` number, since 2 + 1 + 1 + 5 + 515 + 26 + 104 + 12 = 666.

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 7 ways as a sum of consecutive naturals, for example, 97940521237 + ... + 97940521452.

Almost surely, 2^{21155152610412} is an apocalyptic number.

It is an amenable number.

21155152610412 is an abundant number, since it is smaller than the sum of its proper divisors (33691539342788).

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

21155152610412 is a wasteful number, since it uses less digits than its factorization.

21155152610412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195881042702 (or 195881042694 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 36.

Adding to 21155152610412 its reverse (21401625155112), we get a palindrome (42556777765524).

The spelling of 21155152610412 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred fifty-two million, six hundred ten thousand, four hundred twelve".