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21002012210 = 255993506179
BaseRepresentation
bin10011100011110100…
…010100011000110010
32000012122222202121002
4103203310110120302
5321003003342320
613352002002002
71342310105204
oct234364243062
960178882532
1021002012210
1189a80a7693
1240a1646302
131c9916a97a
1410333d8774
1582dbe8675
hex4e3d14632

21002012210 has 16 divisors (see below), whose sum is σ = 37866744000. Its totient is φ = 8386777776.

The previous prime is 21002012209. The next prime is 21002012237. The reversal of 21002012210 is 1221020012.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21002012191 and 21002012200.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1747100 + ... + 1759079.

It is an arithmetic number, because the mean of its divisors is an integer number (2366671500).

Almost surely, 221002012210 is an apocalyptic number.

21002012210 is a deficient number, since it is larger than the sum of its proper divisors (16864731790).

21002012210 is a wasteful number, since it uses less digits than its factorization.

21002012210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3506785.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21002012210 its reverse (1221020012), we get a palindrome (22223032222).

The spelling of 21002012210 in words is "twenty-one billion, two million, twelve thousand, two hundred ten".

Divisors: 1 2 5 10 599 1198 2995 5990 3506179 7012358 17530895 35061790 2100201221 4200402442 10501006105 21002012210