21121151345464 has 8 divisors (see below), whose sum is σ = 39602158772760. Its totient is φ = 10560575672728.

The previous prime is 21121151345407. The next prime is 21121151345501. The reversal of 21121151345464 is 46454315112112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21121151345464² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320071959084 + ... + 1320071959099.

It is an arithmetic number, because the mean of its divisors is an integer number (4950269846595).

Almost surely, 2^{21121151345464} is an apocalyptic number.

It is an amenable number.

21121151345464 is a deficient number, since it is larger than the sum of its proper divisors (18481007427296).

21121151345464 is a wasteful number, since it uses less digits than its factorization.

21121151345464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640143918189 (or 2640143918185 counting only the distinct ones).

The product of its digits is 115200, while the sum is 40.

Adding to 21121151345464 its reverse (46454315112112), we get a palindrome (67575466457576).

The spelling of 21121151345464 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred fifty-one million, three hundred forty-five thousand, four hundred sixty-four".