21000001211012 has 6 divisors (see below), whose sum is σ = 36750002119278. Its totient is φ = 10500000605504.

The previous prime is 21000001211003. The next prime is 21000001211023. The reversal of 21000001211012 is 21011210000012.

It can be written as a sum of positive squares in only one way, i.e., 15386210220676 + 5613790990336 = 3922526^2 + 2369344^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21000001210984 and 21000001211002.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625000151373 + ... + 2625000151380.

It is an arithmetic number, because the mean of its divisors is an integer number (6125000353213).

Almost surely, 2^{21000001211012} is an apocalyptic number.

It is an amenable number.

21000001211012 is a deficient number, since it is larger than the sum of its proper divisors (15750000908266).

21000001211012 is a wasteful number, since it uses less digits than its factorization.

21000001211012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250000302757 (or 5250000302755 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21000001211012 its reverse (21011210000012), we get a palindrome (42011211211024).

The spelling of 21000001211012 in words is "twenty-one trillion, one million, two hundred eleven thousand, twelve".