21214036542340 has 48 divisors (see below), whose sum is σ = 46086740884800. Its totient is φ = 8192816053632.

The previous prime is 21214036542331. The next prime is 21214036542367. The reversal of 21214036542340 is 4324563041212.

It is a super-2 number, since 2×21214036542340² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21214036542340.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25846147 + ... + 26654293.

It is an arithmetic number, because the mean of its divisors is an integer number (960140435100).

Almost surely, 2^{21214036542340} is an apocalyptic number.

21214036542340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21214036542340 is an abundant number, since it is smaller than the sum of its proper divisors (24872704342460).

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

21214036542340 is a wasteful number, since it uses less digits than its factorization.

21214036542340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 853444 (or 853442 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 21214036542340 its reverse (4324563041212), we get a palindrome (25538599583552).

The spelling of 21214036542340 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred forty-two thousand, three hundred forty".