21011012212 has 48 divisors (see below), whose sum is σ = 38968171200. Its totient is φ = 9885024000.

The previous prime is 21011012177. The next prime is 21011012273. The reversal of 21011012212 is 21221011012.

It is a junction number, because it is equal to n+sod(n) for n = 21011012192 and 21011012201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7800738 + ... + 7803430.

It is an arithmetic number, because the mean of its divisors is an integer number (811836900).

Almost surely, 2^21011012212 is an apocalyptic number.

It is an amenable number.

21011012212 is a deficient number, since it is larger than the sum of its proper divisors (17957158988).

21011012212 is a wasteful number, since it uses less digits than its factorization.

21011012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3376 (or 3374 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21011012212 its reverse (21221011012), we get a palindrome (42232023224).

It can be divided in two parts, 21011012 and 212, that multiplied together give a palindrome (4454334544).

The spelling of 21011012212 in words is "twenty-one billion, eleven million, twelve thousand, two hundred twelve".