21022002272 has 24 divisors (see below), whose sum is σ = 41626309536. Its totient is φ = 10450241152.

The previous prime is 21022002271. The next prime is 21022002319. The reversal of 21022002272 is 27220022012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022002271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1893128 + ... + 1904199.

It is an arithmetic number, because the mean of its divisors is an integer number (1734429564).

Almost surely, 2^21022002272 is an apocalyptic number.

It is an amenable number.

21022002272 is a deficient number, since it is larger than the sum of its proper divisors (20604307264).

21022002272 is a wasteful number, since it uses less digits than its factorization.

21022002272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797510 (or 3797502 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

Adding to 21022002272 its reverse (27220022012), we get a palindrome (48242024284).

The spelling of 21022002272 in words is "twenty-one billion, twenty-two million, two thousand, two hundred seventy-two".