21111953012286 has 64 divisors (see below), whose sum is σ = 46559707848000. Its totient is φ = 6352046790656.

The previous prime is 21111953012279. The next prime is 21111953012287. The reversal of 21111953012286 is 68221035911112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111953012287) 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, 23509725 + ... + 24391208.

It is an arithmetic number, because the mean of its divisors is an integer number (727495435125).

Almost surely, 2^{21111953012286} is an apocalyptic number.

21111953012286 is an abundant number, since it is smaller than the sum of its proper divisors (25447754835714).

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

21111953012286 is a wasteful number, since it uses less digits than its factorization.

21111953012286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47901133.

The product of its (nonzero) digits is 51840, while the sum is 42.

Adding to 21111953012286 its reverse (68221035911112), we get a palindrome (89332988923398).

The spelling of 21111953012286 in words is "twenty-one trillion, one hundred eleven billion, nine hundred fifty-three million, twelve thousand, two hundred eighty-six".