21152221413466 has 32 divisors (see below), whose sum is σ = 37275673837248. Its totient is φ = 8874955434240.

The previous prime is 21152221413437. The next prime is 21152221413467. The reversal of 21152221413466 is 66431412225112.

It is a super-2 number, since 2×21152221413466² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21152221413467) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27586021 + ... + 28342423.

It is an arithmetic number, because the mean of its divisors is an integer number (1164864807414).

Almost surely, 2^{21152221413466} is an apocalyptic number.

21152221413466 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21152221413466 is a deficient number, since it is larger than the sum of its proper divisors (16123452423782).

21152221413466 is a wasteful number, since it uses less digits than its factorization.

21152221413466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854206.

The product of its digits is 138240, while the sum is 40.

Adding to 21152221413466 its reverse (66431412225112), we get a palindrome (87583633638578).

The spelling of 21152221413466 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred twenty-one million, four hundred thirteen thousand, four hundred sixty-six".