20000021331 has 16 divisors (see below), whose sum is σ = 28292865408. Its totient is φ = 12523459200.

The previous prime is 20000021291. The next prime is 20000021351. The reversal of 20000021331 is 13312000002.

It is a happy number.

It is not a de Polignac number, because 20000021331 - 2⁶ = 20000021267 is a prime.

It is a super-2 number, since 2×20000021331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20000021351) 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, 374305 + ... + 424386.

It is an arithmetic number, because the mean of its divisors is an integer number (1768304088).

Almost surely, 2^20000021331 is an apocalyptic number.

20000021331 is a deficient number, since it is larger than the sum of its proper divisors (8292844077).

20000021331 is a wasteful number, since it uses less digits than its factorization.

20000021331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799202.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 20000021331 its reverse (13312000002), we get a palindrome (33312021333).

It can be divided in two parts, 2000002 and 1331, that multiplied together give a palindrome (2662002662).

The spelling of 20000021331 in words is "twenty billion, twenty-one thousand, three hundred thirty-one".