21222154652 has 36 divisors (see below), whose sum is σ = 39382650216. Its totient is φ = 10004813280.

The previous prime is 21222154637. The next prime is 21222154669. The reversal of 21222154652 is 25645122212.

It is a super-2 number, since 2×21222154652² (a number of 21 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 in 11 ways as a sum of consecutive naturals, for example, 269858 + ... + 339510.

It is an arithmetic number, because the mean of its divisors is an integer number (1093962506).

Almost surely, 2^21222154652 is an apocalyptic number.

It is an amenable number.

21222154652 is a deficient number, since it is larger than the sum of its proper divisors (18160495564).

21222154652 is a wasteful number, since it uses less digits than its factorization.

21222154652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69906 (or 69885 counting only the distinct ones).

The product of its digits is 19200, while the sum is 32.

Adding to 21222154652 its reverse (25645122212), we get a palindrome (46867276864).

The spelling of 21222154652 in words is "twenty-one billion, two hundred twenty-two million, one hundred fifty-four thousand, six hundred fifty-two".